Introduction to cloud computing and control objectives for information and related technologies ( COBIT )-mapped benefits of cloud computing adoption

This study aims to inform the decision on adoption of cloud computing by a prospective cloud services consumer enterprise, including possible significant benefits of its adoption, in order to ensure informed and accountable information technology (IT) related decision-making. A literature review was performed to obtain information on cloud computing. Additionally, an IT governance control framework was used to systematically identify and categorise significant benefits of the adoption of cloud computing by an enterprise (including governmental organisations and business). The benefits of cloud computing adoption that was discovered include scale benefits and the transformation of a capital expense to a scalable operational expense.


INTRODUCTION
Outsourcing of specialised activities, such as courier and telephony services, by enterprises is common practice in order to cut costs.Scale benefits are derived from outsourcing, as enterprises only pay for the services that they consume.If these functionalities were provided inhouse, the enterprise would usually not be able to consume all the capacity on a continual and uninterrupted basis due to the fluctuating demand for these functionalities (Abraham and Taylor, 1993).The same may be true with regard to an enterprise's information technology (‗IT') functionality.
Research firm Gartner's inquiries reflect that most organisations over-provide their IT infrastructure by at least 100% (Mingay and Govekar, 2010).This is done to Abbreviations: COBIT, Control objectives for information and related technology; CSC, cloud service consumer, CSP; cloud service provider, IaaS, infrastructure as a service; PaaS; platform as a service; SaaS, software as a service; SLA, service level agreement(s).
provide infrastructure for peak utilisation periods and, additionally, to add safety margins to this provision.
Cloud computing is emerging as a possible cost saving solution to this capital intensive over-provisioning of capacity.Gartner defines cloud computing as ‗a style of computing where scalable and elastic IT-enabled capabilities are delivered as a service to external customers using internet technologies' (Plummer et al., 2009).

Research problem
Considerable uncertainty exists among prospective cloud service consumers (CSCs) regarding what cloud computing is and which services can be classified as cloud services (Kushida et al., 2011;Rimal and Choi, 2011;Smith, 2010).
To further complicate matters, cloud computing includes an array of different IT-related services, which could each potentially be acquired on its own (Vaquero et al., 2009), such as internet accessible remote storage space, word and spread sheet processing services and internet-based e-mail services.
Previous research has focused almost solely on the technical aspects of cloud computing.There is a shortage of research literature aimed at guiding prospective CSC enterprises (including governmental organisations and business) in the adoption of cloud computing and the possible benefits and risks thereof (Marston et al., 2011).This amid the fact that the responsibility for IT governance, which includes proper decision-making regarding a definite change in IT strategy towards that of cloud computing adoption, is placed on enterprise managers, specifically the board of directors (King III, 2009).

Research objectives
This study aims to assist in fulfilling the need for consumer guidance by firstly informing managers of prospective CSC enterprises on what cloud computing is, which services may potentially be classified as cloud services, and subsequently identifying significant benefits for CSC enterprises who may be considering the adoption of cloud computing as part of their strategic IT plan.This article does not focus on the incremental risks cloud computing adoption may expose the CSC enterprise to.It is presented on a business and control framework knowledge level in order to empower managers of enterprises (including public sector enterprises) with knowledge on cloud computing, without going into extensive technical detail.
Empowerment of enterprise managers and business professionals is especially relevant as Gartner comments as part of its top predictions for 2012 that control over IT in enterprises seems to be slipping away from IT professionals toward management professionals (Plummer et al., 2011).

RESEARCH METHODOLOGY
A literature review was performed to define cloud computing more comprehensively, thereby enabling prospective CSC to better comprehend what it encompasses.It also explores the different deployment and service models of cloud computing services and provides some examples of providers of these services.
A control framework was then selected to assist in systematically identifying and classifying significant benefits of adopting cloud computing, by means of the framework's specified control processes.The control framework that was selected is control objectives for information and related technology (‗COBIT') version 4.1.The identified significant benefits were confirmed by referencing literature that discusses the relevant issue as a benefit.A prospective CSC enterprise can refer to the literature referenced if further detail on a specific issue is required.This study is the first comprehensive study to map the benefits to a recognised IT risk control and governance framework and thereby distinguishing hype from actual benefits.
COBIT is specifically designed to align IT management and governance with business requirements (COBIT, 2007).This is achieved as COBIT has the following focus areas, namely; strategic alignment, value delivery, resource management, risk management Enslin 10569 and performance measurement.Steenkamp (2011) concluded that COBIT provides a practical complementary framework to address compliance with corporate governance requirements as set out in the Third King Report on Corporate Governance in South Africa.It is therefore specifically suited to this study which focuses on informing enterprise (including business) managers on the paradigm of cloud computing.Only significant benefits are identified as the study does not attempt to represent an exhaustive list of all benefits.Cloud computing is an evolving paradigm (Mell and Grance, 2011;Smith, 2010) with new benefits certain to develop as the computing paradigm matures.

Definition
For the purposes of this study, cloud computing will be defined by combining two currently authoritative definitions.These two definitions encompass the main characteristics of cloud computing.
Cloud computing is ‗a style of computing where scalable and elastic IT-enabled capabilities are delivered as a service to external customers using internet technologies', as defined by Gartner Research (Plummer et al., 2009).These IT-enabled capabilities entail ‗ubiquitous, convenient, on-demand network access to a shared pool of configurable computer resources (for example, networks, servers, storage, applications, and services) that can be rapidly provisioned and released with minimal management effort or service provider interaction', as defined by the National Institute of Standards and Technology of the United States of America (Mell and Grance, 2011).

Main characteristics of cloud computing
It may be helpful to explain the concept of cloud computing in terms of its outcome: A CSC enterprise that fully adopts cloud computing for all IT-enabled capabilities would not need to purchase (capital expenditure) or maintain (operational expenditure) its own IT resources (except for a network accessing device or thin client device and possibly other output-related resources, such as a printer) in order to acquire IT-enabled capabilities relating to the services purchased.It would be accessed, using a network (for example the World Wide Web), the IT resources of a cloud service provider (CSP) and pay only for the usage required by that CSC of these resources.These services are accessed via the internet or other wide area network.However, most CSC enterprises currently adopt cloud computing only for certain IT capabilities and retain other functions in-house (Smith, 2011).
The cornerstone of cloud computing is the delivery of IT-enabled capabilities as services.These services are referred to as cloud services (ISACA, 2009;Mell and Grance, 2011;Plummer et al., 2009).The main characteristics which a service should display in order to qualify as a cloud service, as drawn from the definition, are presented and explained in Table 1.
If IT services exhibit these characteristics, it can be classified as cloud services.These cloud computing services will be deployed, using one of the deployment models discussed in the following area.

Main deployment models of cloud computing
Cloud computing remains an evolving paradigm, resulting in the broadening of deployment models as it continues evolve.

Characteristic
Description On-demand selfservice (1) / Scalable (2) A CSC should have the capability to automatically provision the IT-enabled capabilities and the scale of usage of such capabilities (i.e. increase or decrease network storage etc.), due to automation on the part of the CSP.

Broad network access (1) / Internet technologies (2)
The cloud service should be readily available, independent of the physical location of the CSC and independent of which type of standard network accessing device (such as computer, smart phone etc.) is used (i.e. it should be available using technologies developed around Internet usage).
Resource pooling (1) / Shared pool of resources (2) The cloud services are provided to multiple CSCs by using/sharing the same IT resources of the CSP to achieve economies of scale (often referred to as the multi-tenant model).This also entails that the services are independent of the physical location of the resources of the CSP.
Rapid elasticity (1) / Elastic (2) These IT-enabling capabilities should be elastically scalable with the minimum, if any, time lag.The CSC must be able to rapidly scale up or down the level of IT capabilities required.This usually creates the impression with the CSC that the information technology resources are unlimited.

Measured service (1) / Metered by use (2)
The CSP should have an accounting system in place that keeps record of resource usage in order to provide for billing of usage, relevant to the IT capabilities used by each CSC.This equates computing resources to commonly known utilities, such as electricity and telephone services.However the actual billing plans may take on different forms (e.g.pay-as-you-use, prepaid, fixed plans etc.) (1) Characteristics according to USA National Institute of Standards and Technology (Mell and Grance, 2011); (2) Attributes according to research firm Gartner (Plummer et al., 2009).

Public cloud
The cloud infrastructure is made available to the general public or a large industry group (this is the CSCs) and is owned by a CSP, which sells these cloud services.

Private cloud
The cloud infrastructure is operated solely for a single CSC enterprise.It may be managed by the enterprise or a third party and may exist on or off the CSC's premises.

Community cloud
The cloud infrastructure is shared by several CSC enterprises and supports a specific community that has shared concerns (e.g.mission, security requirements, policy, and compliance considerations).It may be managed by the enterprises or a third party and may exist on or off the community premises.

Hybrid cloud
The cloud infrastructure is a composition of two or more clouds (private, community or public) that remain unique entities, but are bound together by standardised or proprietary technology that enables data and application portability (for example, cloud bursting for load balancing between clouds).
Source: ISACA (2009) (amended).Plummer et al. (2009), on behalf of Gartner, indicated two deployment models, namely public cloud computing (or public cloud) and private cloud computing (or private cloud).ISACA (2009), previously known as the information systems audit and control association, expanded the deployment models to include community and hybrid cloud computing, as presented in Table 2.
It is expected that governments will utilise the community cloud computing model to provide IT resources to governmental departments.
Different IT capabilities can be delivered using these deployment models.The next area will explore the main service models into which these IT capabilities are divided.

Main service models of cloud computing
The three main service models are derived from the IT capabilities that are provided in each case.
These can be provided either alone or, most often, in combination.The service models are infrastructure as a service (IaaS), platform as a service (PaaS) and software as a service (SaaS) (Mell and Grance, 2011).Certain literature refers to these service models as cloud service ‗layers' (Jensen et al., 2009), as these services can indeed be, and often are, layered upon each other in implementation (Winkler, 2011).Table 3 elucidates the three main service models.
It should be noted that the CSC usually does not own the underlying cloud infrastructure in any of the aforementioned cases.

Service model Description
Cloud infrastructure as a service (IaaS) The IT capability provided is that of processing, storage, network and other computer hardware-related capabilities.The CSC can run its own software (including operating system) on the computer hardwarerelated capability.
Cloud platform as a service (PaaS) The IT capability provided is that of a computing platform on which to run the software of the CSC, which was created using the programming languages and protocols supported by the specific platform.
Cloud software as a service (SaaS) The IT capability provided is that of software applications for use by the CSC.The software would be run on cloud infrastructure (either that of the SaaS provider or possibly that of another IaaS and/or PaaS provider), and be accessible by means of a network accessing device.
This study encompasses all three service models and may be adjusted if utilisation of only one or two of the service models is contemplated.

Examples from the marketplace of CSPs
In order to provide an overview of how CSPs implement these deployment models and service models in practice, examples of CSPs and the related services that they offer are presented in Tables 4 to 6.The CSPs in each table are listed in alphabetical order.Table 4 summarises the services provided by some of the key CSPs.
It can be seen that well known and successful IT organisations are experimenting with different cloud service offerings.This serves as a convincing indicator of the way IT services are developing and that these large organisations see cloud computing as a worthwhile direction to pursue.
As the services offered are currently so diverse, various needs exist to ensure the technology is available to support these services.Table 5 lists service providers that provide technology that enables and complements the provision of cloud services by CSPs.
Table 5 also illustrates the evolving nature of cloud computing.Cisco's planned portability standards, when finalised, would go far to lower the risk for CSC enterprises of becoming ‗locked-in' at one CSP.
Another gap that is exploited by IT organisations is to provide support service to CSC enterprises.Table 6 lists a few cloud service support providers in order to further illustrate the resilience of the market with regard to cloud computing and related services.
The adoption of cloud computing by a prospective CSC enterprise may thus involve enlisting the services of several providers of cloud related services.The significant benefits which a prospective CSC may derive from utilising these and other CSPs' offerings are presented in the following area.

SIGNIFICANT BENEFITS OF CLOUD COMPUTING ADOPTION
The research findings regarding these significant benefits are presented in Table 7. COBIT 4.1 is divided into four domains which are further sub-divided into 34 processes.The processes are numbered in the following manner: 1. Firstly, the relevant domain is stated in an abbreviated fashion, being either PO for ‗Plan and Organise' domain, AI for ‗Acquire and Implement' domain, DS for ‗Delivery and Support' domain and ME for ‗Monitor and Evaluate' domain; and 2. Secondly, the processes in each domain are numbered.
All 34 processes were considered for this study to ensure completeness, but only the processes which could be linked to significant benefits are presented in the research findings table.
The left-hand column of this table represents the COBIT process for which a significant incremental benefit(s) accompanying the adoption of a cloud computing approach was identified, while the right-hand column contains a description of the identified benefit(s).Most of the significant benefits identified are supported by authoritative publications and earlier research, as indicated by numerals in brackets that correspond to the numbered list of these references listed below Table 7. References were only indicated where publications and research dealt with the benefit in relative detail.

RESULTS AND DISCUSSION ON MAIN BENEFITS OF CLOUD COMPUTING ADOPTION
The majority of the benefits listed earlier relate to the scale benefits that are gained by the CSP by having a significantly larger scale IT operation than any single CSC enterprise would reasonably be able to attain on its own.These benefits include the ability to attract and employ more highly skilled IT professionals, implement better continuation and security controls, diversifying physical location of data and back-up centres, providing better support as well as the ability and need to continually upgrade the hardware and software which is utilised to provide the IT capabilities.These benefits are subsequently passed on to the CSC enterprise in terms of a better IT service than the CSC could have provided for itself.A portion of the cost benefits is also passed on to the CSC enterprise.
The fact that cloud computing enables a CSC enterprise to exchange the traditional capital expenditure required to expand an enterprise's IT capacity for operational expenditure, in terms of a pay-as-you-use model, also represents a major benefit.As a result, an enterprise requires significantly less capital to start up or to expand, as it need not purchase an extensive IT system, but can scale its IT capabilities from its CSPs,

Amazon
Amazon offers its Amazon Web Services, a suite of several services which includes the elastic compute cloud (EC2), for computing capacity, and the simple storage service (S3), for on-demand storage capacity.
In addition to these core offerings, Amazon offers the SimpleDB (a database web service), the CloudFront (a web service for content delivery) and the simple queue service (a hosted service for storing messages as they travel between nodes).

Apple
Apple introduced its cloud offering, ‗iCloud', in 2011, as a central repository for applications, media files, documents, backups, settings and other items.Apple allows CSCs to synchronise their data from their computers and mobile devices to a personalised central repository.The central repository on the Internet subsequently synchronises all of the data and media files back down to all of the CSC's devices, so that all devices have the same data (Hiner, 2011).
AT&T AT&T provides two cloud services: Synaptic Hosting, which enables CSCs to store Windows serve, Linux client server applications and web applications on AT&T's cloud; and Synaptic Storage, enabling CSCs to store their data on AT&T's cloud.AT&T provides one key component of the requisite infrastructurethe network backbone, and has experience in billing for it (i.e. they have an established revenue model).AT&T is currently adding data services to its offering.

Enomaly
Enomaly's Elastic Computing Platform (ECP) integrates enterprise data centres with commercial cloud computing offerings, allowing IT professionals to manage and govern both internal and external resources from a single console, while making it easy to move virtual machines from one data centre to another.

Google
Google's App Engine offers CSCs access to Google's cloud-based platform, which provides tools to build and host web applications.Its premier SaaS offering is Google Apps, a set of online office productivity tools, including e-mail, calendaring, word processing and a simple website creation tool.Its acquisition of Postini, which offers a set of e-mail and web security services, makes it a credible provider in the area of electronic corporate communications.

IBM
IBM's cloud computing service, known as Blue Cloud, offers CSC enterprises access to tools that allow them to manage large scale applications and databases via IBM's cloud.The company offers consulting services to help companies integrate their infrastructure into the cloud.

Microsoft
Windows Azure, the ‗cloud operating system' PaaS appeared in early 2010.Additionally, they are creating the Azure services platform to run on the Windows Azure operating systems, giving CSC enterprises access to several online Microsoft services like Live, .Net, SQL, SharePoint and Microsoft's Dynamic CRM.Developers of cloud applications can potentially mix and match the building block services (for example, SQL services, NET services, Live services, etc.) that will run on the base Azure ‗operating system'.Microsoft intends to offer its own cloud applications (for example, exchange online) that will run off the Azure platform.

SalesForce.com
SalesForce.com is the first well-known and successful SaaS application.It has also introduced Force.com, an integrated set of tools and application services that independent software vendors and corporate IT departments can use to build any business application and run it on the same infrastructure that delivers the Salesforce CRM applications.It includes the company's Apex programming language.
and connect from new locations to the cloud at pay-asyou-use rates.A recent survey of more than 400 small to medium companies based in the United States of America, conducted by Techaisle on behalf of Dell Cloud Business Applications (Dell and Techailse, 2011) confirms the main benefits experienced by early adopters of cloud computing as follows: a) 81% of respondents believe cloud computing enabled them to get to the market faster due to faster deployment times; and b) 85% of respondents gained capabilities that they were not previously able to afford.
The respondents also state that the lower total cost of ownership, and automated upgrades and updates prove to be significant benefits.
Additionally, due to the broad network access or

Cisco
Cisco is actively working on a set of standards that will allow portability across CSPs.One crucial aspect of this task is ensuring workload portability from one autonomous system to another, which includes the consistent execution of the workload on the new system (that is, the execution of the complete IT policy associated with that workload).
EMC EMC provides two key components in cloud computingstorage and virtualisation software (thanks to its acquisition of VMWare).EMC is also offering specialised storage solutions for cloud applications.The company has also introduced their vCloud initiative, which allows CSC enterprises to run their in-house applications on a cloud and be interoperable with other cloud services from other CSPs within the vCloud ecosystem.
Source: Marston et al. (2011) (amended).internet technology access, that forms part of the characteristics of cloud computing, mobile access to IT resources increases to any location where access can be gained to the specific network or the internet, as well as to any device that the CSP's systems may support.Another advantage that is often overlooked is the fact that a CSC enterprise may indeed lower its negative impact on the environment by changing to cloud computing.According to a study by Mingay and Govekar (2010), the economies of scale achieved by the shared pool of resources which is utilised by the CSP to provide the cloud services, also apply to environmental impact.For example, the CSP is in a better position, due to the scale of its IT operations, to ensure that large data centres are run on an energy efficient basis.This would have the additional benefit of saving the CSP energyrelated costs.

OTHER IMPLICATIONS
A CSC enterprise may gain a competitive advantage from the adoption of cloud computing as it will save the enterprise IT related cost and enable the enterprise to transform a capital expenditure into a scalable operational expenditure.
However, all the benefits of cloud computing adoption must be considered in the context of the incremental risks that the adoption of cloud computing may expose the prospective CSC enterprise to.The fact that incremental risks exist can be deducted by looking at the nature of cloud computing which entails the transmission of data over a wide area network or even the internet, many enterprises' data possible stored and/or processed on the IT resources of a single CSP and the critical reliance on the CSP's controls.The risks were not specifically addressed by this study.ISACA (2009) provides a list of risks related to cloud computing adoption.A list of risks and possible risk mitigating controls as mapped to COBIT is provided by Enslin (2012).The main risks include third party access to sensitive information, possible connectivity downtime (internet and network access) leading to unavailability of IT resources and not being able to switch between different CSPs.In a developing country context,

COBIT process
Possible benefit PO1 Define a strategic IT plan 1.Adds a new dynamic as the outsourcing of capital expenditure in hardware, operating platform and software as all become viable options (3) (7).

PO3 Determine technological direction
1. Cloud services supports business opportunities, such as expansion of business (e.g.opening new branches), as it enables expansion of IT capabilities with minimal capital outlay in terms of IT infrastructure (3) (4) (7) (10).
2. The economies of scale also have a positive environmental impact.Adoption may lower a CSC enterprise's carbon footprint (‗greener' business practice) (6).

PO5 Manage IT investment
Cloud services enable the realisation of economies of scale by CSPs, due to the multi-tenant principle, that each CSC enterprise would not be able to realise on its own.In order to be competitive in the future cloud computing market, the CSP would have to pass some of the benefits of these economies of scale through to the CSCs.This should enable a CSC enterprise to achieve a better return on IT investment (3) (4) (5) (7) (10).

PO7 Manage IT human resources
The number of IT staff members required by a CSC enterprise is likely to decrease with the adoption, thereby ensuring a savings in operational expenditure relating to a decrease in human resources (1).

PO8 Manage quality
Most aspects are outsourced to the CSP.The CSC enterprise should benefit from economies of scale of the CSP relating to the cost and employment of specialised IT professionals to ensure adequate controls.The CSP's reputation depends on the adequacy of controls (4) (10).

PO9 Assess and manage IT risks
Certain IT risks, previously managed solely by the CSC enterprise, are now part of the outsourced services, enabling the enterprise to possibly benefit from the CSP's superior ability to attract and employ specialised IT risk mitigating professionals, due to the CSP's increased economies of scale (4) (7) (10).
AI1 Identify automated solutions 1. Cloud services provides automated solutions to satisfy infrastructure (hardware) requirements that could not traditionally be satisfied by automated solutions (specifically Iaas and Paas) (2) (10).2. Saas and PaaS are also subject to greater automation than traditionally possible (2).
3. A CSC enterprise can experiment with a larger array of different innovative IT capabilities and technologies than it would have been able to afford if it had to purchase such technologies before experimenting with them (5).4. The usage of Internet technologies also enables access, irrespective of location, as an option (5) (10).

AI2 Acquire and maintain software
Patching and version upgrades of software would be up to date if a trustworthy CSP (consider including this in a Service Level Agreement (SLA)) is used who will benefit from economies of scale regarding such upgrading or patching.This can be achieved without the usual capital expenditure required on the CSC enterprise's side (7) (10).

AI3 Acquire and maintain technology infrastructure
Technology infrastructure would be up to date if a trustworthy CSP (consider including this in an SLA) is used who will benefit from economies of scale regarding such upgrading of infrastructure.This can be achieved without the usual capital expenditure required on the CSC enterprise's side (3) (4) (7) (10).
AI4 Enable operation and use Cloud services are characterised by a multi-tenant model.Accordingly, the CSP should have standardised user manuals and/or training available to all CSCs (tenants).
AI6 Manage changes 1.Most cloud services-related changes, such as patching and/or upgrading of infrastructure, are done by the CSP, significantly reducing the workload regarding the management of changes on the CSC enterprise's side (7).
2. The level of IT capabilities required by the CSC can be scaled up or down through a selfservice process.This significantly decreases the number of controls which were traditionally needed, where changes to IT capabilities required major changes such as the installation of a new server, etc. (3) (8).

DS3 Manage performance and capacity
Cloud services are characterised by rapid elasticity on-demand, ensuring that IT resource capacity can be rapidly scaled up or down to meet the CSC enterprise's changing requirements at all times (3) (4) (5) (7) (10).
DS4 Ensure continuous service 1.Most aspects are transferred to the CSP.The CSP will be inclined to ensure adequate controls relating to continuity of services due to the fact that a significant number of the CSP's CSCs may be affected by downtime as a shared pool of resources is used to provide services to all of the CSP's CSCs.Any interruption of services will have a major impact on the CSP's reputation (3) (4) (5). 2. As cloud services are provided using broad network access (Internet technologies), continuation of service is not dependent on the location of the CSC enterprise's users.This means the CSC enterprise can easily access the IT capabilities from different locations (enhanced mobility) (5) (10).
3. As cloud services are provided using broad network access (Internet technologies), continuation of service is not necessarily dependent on a specific access route to a network or the Internet (.i.e. if the ADSL line is not functioning, 3.5G wireless access could, for example, be used to continue service in the interim).This could translate into fewer single points of failure (‗SPOF') risk than in the case of leased VPN lines, for example.4. Also refer to PO9.
DS5 Ensure systems security 1.Most aspects are transferred to the CSP who will be inclined to ensure adequate controls relating to security due to the fact that a security breach relating to inadequate controls on the CSP's side will have a major impact on the CSP's reputation (3) (5). 2. Also refer to PO9.

DS6 Identify and allocate cost
Cloud services are measured or metered by use.The CSP would therefore already have such an accounting/metering system in place.This system could possibly meter use by individual groups within the CSC enterprise, making the allocation of IT-related costs to different segments of the CSC enterprise a vastly simpler task.
DS7 Educate and train users Refer to AI4.

DS8 Manage service desk and incidents
Most aspects are outsourced to the CSP who would be required by all its CSC enterprise clients to have an adequate service desk to resolve user queries and incidents.The adequacy of this service will influence the CSP's reputation.

DS9 Manage configuration
Most are outsourced to the CSP.The CSP should benefit from economies of scale relating to the cost and employment of specialised IT professionals to ensure adequate controls.The CSP's reputation depends on the adequacy of controls (10).the limited internet infrastructure also represents a barrier to successful cloud adoption, as continual and rapid internet or network connectivity is required (Knipp, 2011).
A holistic view of cloud computing should then be compared to the main business imperatives of each prospective CSC enterprise in order to decide whether it is an appropriate IT direction for the enterprise to pursue.This will also inform decisions on the level of implementation of cloud computing in the enterprise, versus the retention of certain functions in-house.
As the IT department within the CSC enterprises is likely to become significantly smaller by the transferring of workload to CSP, which cloud computing is characterised by, CSC enterprise managers are expected to start playing a larger role in the residual IT related decision-making within the enterprise.

Conclusion
The possible benefits that the advent of cloud computing may hold for businesses to manage its IT resources more economically resulted in enormous interest in this topic.However, since suppliers of IT services started terming many of their services as -cloud services‖, a lot of uncertainty developed among consumers of IT services as to which services should correctly be referred to as cloud services and as to which actual benefits can be derived from utilisation of these cloud services.
From a study of literature it was found that cloud computing, and accordingly cloud services, refer to IT services that are provided by a cloud service provider (CSP) to one (private cloud) or more (public and hybrid clouds) cloud service consumers (CSCs), by utilising the CSP's pool of IT resources and sharing access there to the CSCs through a broad network or even the internet.The CSCs can scale their demand for these elastic IT services as required by them and pay only for their specific measured usage of these services.These IT services may refer to services related to IT infrastructure (IaaS), IT platforms for applications to run on (PaaS), IT software applications (SaaS) or even combinations of these services.
The characteristics of cloud services may result in, amongst others, the following benefits for CSCs that decide to adopt cloud services for their IT requirements: 1. Conversion of what would have been IT related capital expenses for the CSC to scalable operational expenses.This translates into less start-up costs for new branches or businesses.2. Gaining from the economies of scale of the CSP.Due to the size of the shared pool of resources from which the CSP provides the cloud services, it possess the size to employ the better personnel, purchase better infrastructure and purchase and ensure better upgrades and updates.3. Increased mobility.Access to IT resources from any location with the relevant network or internet access, and by using any device supported by the CSP's system.4. Lowered environmental impact of IT resources due to CSP's economies of scale.These benefits should be evaluated against the possibility of the incremental risks that may arise from reliance on the CSP and the security issues regarding remote access paths and the shared pool of resources.The study of these and other incremental risks for CSCs resulting from cloud computing did not form part of this study.
outsourced to the CSP.The CSP should benefit from economies of scale relating to the cost and employment of specialised IT professionals, securing the physical environment and ensuring off-site backup (distributed data centres) to ensure adequate controls.The CSP's reputation depends on the adequacy of controls (10).

Table 1 .
Main cloud computing characteristics.

Table 2 .
Main cloud computing deployment models.

Table 4 .
Key cloud computing service providers.

Table 5 .
Key cloud computing technology providers.Hadoop is an open-source software framework that has inspired the development of database and programming tools for cloud computing.

Table 6 .
Key cloud computing service support providers.
ProviderDescription of serviceCapGeminiCapGemini is the first major professional services firm to pursue a partnership on Google Apps Premier Edition (GAPE) for CSC enterprises.It uses Google's software as a service initiative to seize opportunities among large CSC enterprises.CapGemini's GAPE service offerings reside within its wellestablished and mature Desktop Outsourcing Services practice.RightScaleThe RightScale Platform is an SaaS platform that helps CSC enterprises to manage the IT processes they have outsourced to CSPs.It deploys new virtual servers and applications, performs load balancing in response to changing needs, automates storage backups, and offers monitoring and error reporting.VordelVordel offers several hardware and software products that help CSC enterprises to deploy cloud-based applications.Vordel provides the governance, performance, interoperability and security framework to enable CSC enterprises to exploit cloud computing.Source:Marston et al. (2011) (amended).

Table 7 .
Mapping of significant benefits of cloud computing to COBIT.