CGS
Christine Wilson_CGS 2501-4_Team Work_Final_Week 9

Christine Wilson_CGS 2501-4_Team Work_Final_Week 9 - 1...

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12/11/2014 1
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Table of Contents 12/11/2014 2
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Detailed Analysis The analysis phase is the second step in the system development life cycle (SDLC). It consists  of two major activities: (1) conduct a preliminary investigation and (2) perform detailed  analysis. This document discusses the detailed analysis phase of the SDLC. Prior to this phase, the planning phase will have been completed, and the preliminary  investigation, or feasibility study, would be completed. Only after these two steps would the  detailed analysis phase begin. Sometimes called logical design because the systems analysts develop the proposed solution  without regard to any specific hardware or software, detailed analysis involves three major  activities:  1. Study how the current system works 2. Determine the users’ wants, needs, and requirements 3. Recommend a solution Most systems analysts use either a process modeling or object modeling approach to analysis  and design. The following sections discuss these approaches. Process Modeling Process modeling, sometimes called structured analysis and design, is an analysis and design  technique that describes processes that transform inputs into outputs. Tools that a systems  analyst uses for process modeling include entity-relationship diagrams, data flow diagrams,  and the project dictionary. Entity-Relationship Diagrams An entity-relationship diagram (ERD) is a tool that graphically shows the connections among  entities in a system. An entity is an object in the system that has data. For example, a school  might have student, grades, class, room, and instructor entities. On the ERD, entity names usually are nouns written in all capital letters. Each relationship  describes a connection between two entities. It is important that the systems analyst has an  accurate understanding of the system. The systems analyst reviews the ERD with the user.  After the users approve the ERD, the systems analyst identifies data items associated with  the entity.
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  • Winter '15
  • shanelauber
  • ........., systems analyst

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