Needs analysis phase of the mission, including the following areas:
1. Determine the comprehensive needs of the system
Data requirements 2. Analysis System
It is summarized by the flow of information in addition to the system abstract data elements, logic data, data dictionary and data model format. And expressed in a structured way of IPO
3. Export logical model system
The current system is the basis of understanding "how to" on, extracts its "what" of nature
4. correction system development plan
The prototype system
The principles of needs analysis
1. The data and functional domains and must be able to understand the problem of expressing
2. Press the top-down, layer decomposition problem
3. The logical view is given to the physical view of the system and
Needs analysis methods
The most common: Structured Analysis (abbreviated SA method) is a method for data flowing from the top-down stepwise refinement requirement analysis
Common methods of analysis
Method for the structural analysis of data streams SA
The method for data configuration of JSD Jackson
Structured data system development method DSSD
Object-Oriented Analysis OOA
Assessment of needs analysis
Must verify software requirements from four different angles, consistency, completeness, actuality, correctness and validity
