System Lifecycle

System Lifecycle

1. Problem Definition

   • To determine why a new system is needed
   • Scope
   • What it's supposed to do

2. Feasibility Study

   • TELOS
     • Technical Feasibility
     • Economic Feasibility
     • Legal Feasibility
     • Operational Feasibility
     • Schedule Feasibility

3. Information Collection

   • Questionnaires
   • Interview
   • Documents
   • Observation
   • Focus groups
   • Case Studies

4. Analysis

   • Definitions of what is required
     • Requirement Specs: by the system analyst in the analysis stage
     • Design Specs: the system designer during the design stage

5. Design

   • In this phase the system and software design is prepared from the requirement specifications which were studied in the first phase. System Design helps in specifying hardware and system requirements and also helps in defining overall system architecture. The system design specifications serve as input for the next phase of the model.

6. Implementation

   • Waterfall Model
   • RAD
   • Documentation
     • In this phase, the system is installed and made operational in the production environment after the system and users’ acceptance testing. Activities in this phase include efforts required for implementation including notification to end users, execution of training, data entry or conversion, and system monitoring. This phase continues until the production system is operating in accordance with the defined requirements and planning for sustainment has begun.
       • Technical
       • User
       • System
   • The work is divided in modules/units and actual coding is started. Since, in this phase the code is produced so it is the main focus for the developer. This is the longest phase of the software development life cycle.
   • Prototyping
   • Coding, using a programming language

7. Evaluation

   • To see if the system has fit the criteria
   • Testing
     • White box
     • Dry run - aka Professor X method
     • Black box
     • Erroneous; Valid; Extreme

8. Installation

   • Pilot
   • Phased
   • Direct
   • Parallel
   • http://goo.gl/0Hgxxr

9. Management

   • Adaptive
   • Perfective
   • Corrective

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