Software Development Life Cycle

Software Development Phases:

Information Gathering: It encompasses requirements gathering at the strategic business level.

Planning: To provide a framework that enables the management to make reasonable estimates of

• Resources
• Cost
• Schedules
• Size

Requirements Analysis: Data, Functional and Behavioral requirements are identified.

• Data Modeling: Defines data objects, attributes, and relationships.
• Functional Modeling: Indicates how data are transformed in the system.
• Behavioral Modeling: Depicts the impact of events.

Design: Design is the engineering representation of product that is to be built.

• Data Design: Transforms the information domain model into the data structures that will be required to implement the software.
• Architectural design: Relationship between major structural elements of the software. Represents the structure of data and program components that are required to build a computer based system.
• Interface design: Creates an effective communication medium between a human and a computer.
• Component level Design: Transforms structural elements of the software architecture into a procedural description of software components.

Coding: Translation into source code (Machine readable form)

Testing: Testing is a process of executing a program with the intent of finding error

• Unit Testing: It concentrates on each unit (Module, Component…) of the software as implemented in source code.
• Integration Testing: Putting the modules together and construction of software architecture.
• System and Functional Testing: Product is validated with other system elements are tested as a whole
• User Acceptance Testing: Testing by the user to collect feed back.

Maintenance: Change associated with error correction, adaptation and enhancements.

• Correction: Changes software to correct defects.
• Adaptation: Modification to the software to accommodate changes to its external environment.
• Enhancement: Extends the software beyond its original functional requirements.
• Prevention: Changes software so that they can be more easily corrected, adapted and enhanced.