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copied!<p>XaaS, where X is some kind of service, describes <strong>a specific Service Model of Cloud Computing</strong>. Therefore, an XaaS designates the nature of the service delivered to a client. There are lots of arconyms describing such models, however a vast majority of sources focus on the following three:</p> <ol> <li>Software as a Service (SaaS)</li> <li>Platform as a Service (Paas)</li> <li>Infrastructure as a Service (IaaS)</li> </ol> <p>You can also meet the term Hardware as a Service (Haas) which is closely related to #3. The obvious <strong>difference</strong> between SaaS and the rest, is that SaaS delivers software, and not a platform (for software development) or infrastructure. It can target the end-users, while PaaS and IaaS usually target developers or organizations that want to use them in order to create Saas (for internal purposes or for delivering software to users).</p> <p>For more information about Cloud Computing <strong>taxonomies</strong>, please search for the following papers:</p> <ul> <li>Cloud Computing Use Case Discussion Group: Cloud Computing Use Cases White Paper v. 4.0</li> <li>Bhaskar Prasad Rimal et. al., A Conceptual Approach for Taxonomical Spectrum of Cloud Computing</li> <li>Lamia Youseff et. al., Toward a Unified Ontology of Cloud Computing. </li> </ul> <p>The idea of SaaS is that the method of Software development and delivery deviates from the standard model. The Term SaaS existed <strong>even before</strong> the one of Cloud Computing. It's meaning can be highly confusing as the semantics look similar to plenty of web-service-based terms and architectures(e.g. SOA). <strong>Always bear in mind that SaaS describes a Service Model, and not some kind of architecture or methodology</strong>. Some good scientific sources about the origins of the term, as well as the evolution of it as a development and business model are the following:</p> <ul> <li>Keith Bennett et. al., Service-Based Software: The Future for Flexible Software</li> <li>Vidyanand Choudhary, Software as a Service: Implications for Investment in Software Development</li> <li>Hancheng Liao et. al., An Anatomy to SaaS Business Model Based on Internet.</li> </ul>

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