Software as a Service (SaaS) :
SaaS is a delivery model allowing for on-demand licensing of software services providing a cost-effective alternative across the web. SaaS has the following attributes:
- Accessibility and reliability: ability to easily, consistently, and frequently access service offerings within SaaS when required due to the critical use of software services for end users of supported business operations.
- Standardised IT-based capability: ability to provide the same quality of service as existing on-site software vendors, such as timely deployment of critical patches, configurability due to multi-tenancy on the cloud.
- Customer service and enterprise presence: sustainable market presence within the SaaS service offering and ability to provide customer service comparable to licensed software products, such as SAP and Oracle.
Accessibility and reliability
Salesforce.com continues to build value in its sixtier, user-based pricing model with its premier support delivering 24/7 live phone support and priority phone queues, two-businesshour response time, an assigned customer service representative, application programme interface (API) support, outsourced admin services, and CRM health checks.
Cost
Google, Microsoft – Vendors with large economies of scale for cloud-based infrastructure, such as Google and Microsoft, will drive prices down for software applications, such as office productivity
suites and customer relationship management software.
Enterprise presence
Salesforce.com is a leading example of the SaaS cloud computing model. It services nearly 40,000 customers around the world and is growing rapidly.
Platform as a Service (PaaS)
PaaS is a delivery model that manages the facilities required to support the complete life cycle of building and delivering applications and services from the web.
- Application base and support: ability to provide services to support the development life cycle with all the required tools to provide a quality product, including but not limited to, version control, source code control and integration with existing tools.
- Elasticity and scalability: ability to provide the same level of service for development processes while quickly allowing upward or downward scalability of services as development teams ramp up or down during phases of the SDLC.
- Developer affinity, customer service, and enterprise presence: ability for developers to utilise existing skill sets with various tools available to provide the same quality of service throughout application development; sustainable market presence within PaaS.
Elasticity and scalability
Google, Microsoft, and salesforce.com promise to deliver highly reliable PaaS services.
Standardised IT-based capability
Google, salesforce.com, Amazon Web Services – One of the key strengths of PaaS offerings is the foundation in data centre architectures pioneered by the likes of Google and Amazon.
Customer service
Google Apps, salesforce.com – Established PaaS products, such as Bungee Connect, Caspio Bridge, Google App Engine, and salesforce.com are providing value to application development and
program management teams.
Infrastructure as a Service (IaaS)
IaaS is a cloud computing model that facilitates the delivery of computer resources as a service. IaaS enables a customer to buy resources as a fully outsourced service rather than purchasing servers, software, data centre space, or network equipment. It has the advantage of near instantaneous scalability in turn providing a cost-effective and flexible solution. IaaS has the following attributes:
- Elasticity and scalability: ability to retain the same level of service while quickly allowing infrastructure components to be scaled upward or downward in a timely fashion throughout the entire software development lifecycle.
- Standardised IT-based capability: ability to provide the same quality of service as existing on-site infrastructure, such as communication infrastructure, help desk availability, servers, storage, etc. so that the service levels to the end users are not impacted.
- Customer service and enterprise presence: sustainable market presence within laaS service offerings and the ability to provide more robust infrastructure services without sacrificing service requirements in critical business areas.
Elasticity and scalability
Amazon Web Services (AWS) – includes the Elastic Computer (EC2), Simple Storage Service (S3), and Simple DB. Akamai – includes scalable solutions for web applications.
Standardised IT-based capability
AWS – is a service provider for end user requisition of computing power, storage, and other services.
Customer service
IBM and HP have an enterprise presence in IT infrastructure, while Amazon and Rackspace are developing their customer service expertise in this area under the new service delivery method.
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