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19 Cards in this Set

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Systems investigation
first step in develop of new system. its purpose is to determine whther the ojectives are satisfying the goals of the organization..so u try to uncover problems and scope of them
Feasibility analysis
investigates the problem to be solved or opportunity to be met..it involves technical, economic ,legal,Sschedule and operational feasibilities
Technical feasibility
concerned with if hardware, software can be acquired or developed.
Economic feasibility
if projectmakes financial sense and predicted benefits will offset costs and time needed to obtain them
Legal feasibility
whether laws or regulations may prevent systems development project
Operational Feasibility
measure of whther or not the project can be put into action or operation...included both physical and motivaltional considerations
Schedule feasibility
determines if project can be completed in a reasonable amount of time...meeting time requirements
Steps for large organization to evaluate computer system
1. Collecting appropriate data
2. Analyzing the data
3. Determining new sysetm requirements and project priorities
Data Collection requires
1. Interviews
2. Direct observation
3. Outputs
4. Questionnaires
5. Other collection methods
Three steps of data collection
1. Identify data sources
2. Data Collection
3. Follow-up and clarification
Two types of interviews
Structure interview: question written in advance
Unstructures: questions not written in advance
Direct observation
one or more membersof analysis team observe existing system in action
Outputs
manual and computerized from existing system are collectede.g previous bills sent
Other data collection methods
telephone calls, simulating events, taking random samples
Data Analysis
raw data is not useful so two tools are used that are:
1. Application flowcharts
2. CASE tools
Requirements analysis
determine user, stakeholer, organizational needs
Tool for requirement analysis
1. Asking directly (best for stable systems with users or stakeholders with a clear understanding of systems functions)it usu fails as individuals dont know what they want or need
2. Joint Application developmet
3. Rapid application development
JAD
Joint application deelopment: used in place of traditional data collection and requirements analysis...involves group meetings to define requirements of new system...meeting of problem holders and solution providers
RAD
determine and define systems requirements of a group...it combines JAD...INVOLVES PROTYPINg and then presenting it to the managers after which it is refined and analysed.