1.The work to be done 2.The skills, creativity, experience, culture of the worker 3.The state of the art, available descriptive technology 4.The Enterprise data available etc. In short, there is not one kind of relevant model the kinds of relevant models are virtually infinite and not likely predictable until needed and created. Enterprise Architecture is: 1. A conceptual structure used to develop, implement and sustain an enterprise architecture. 2. The organising logic for business processes and IT infrastructure reflecting the integration and standardisation requirements of an organisation's operating model. 3. Figure 2: The data architecture map shows which models exist for which major data areas in the enterprise. A complete data architecture is a band across the middle. The models which comprise the data architecture are described in more detail in the following sections. The groupings on the horizontal access will vary from enterprise to Enterprise Architecture (EA) is a group of documents that describe companies from an integrated business and Information System (IS) / Information Technology (IT) perspective to bridging the For example, some EA develop tasks will be established . as outlined tasks to focus on rapid identification and brainstorming without full details. 6. Plan for iterations to circle back and enhance detail as time allows. Begin with high-level outlines for broader scopes (enterprise or LOB), and follow with iterations to detail subordinate areas. 7.