Linear Sequential Development - Classic life cycle - Waterfall model - Introduction of Software Engineering

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• viresh   -Posted on 21 Jul 16
  Bsc nursing
• Nirja Shah   -Posted on 12 Oct 15
  - The simplest process model is the water fall model which states that the force is organized in a linear order.
  
  - So it is also known as the linear sequential model or classic life style model.
  
  - The linear sequential model is the oldest and one of the most widely used paradigm for software engineering.
  
  - It suggests a systematic, sequential approach to software development that begins at the system level and progresses through analysis, design, coding, testing and maintenance.
  
  - Modeled after the conventional engineering cycle, the linear sequential model encompasses the following activities.
  
  System / Information Engineering
  - As software is always a part of larger system (or business), work begins here by establishing requirements for all system elements and then allocating some subset of these requirements to software.
  - This view is essential when software must interface with other elements such as hardware, people, and databases. This provides Top-Level design and analysis.
  
  Software requirements analysis
  - This process is intensified and focused specifically on software.
  - Analysis is important for the software engineer to understand the information domain for the software, required functions, behavior, performance, and interfacing.
  - Requirements for both the system and the software are documented and reviewed with the customer.
  
  Design
  - This is a multi-step process that focuses on data structure, software architecture, procedural detail and interface characterization.
  - It translates requirements into a representation of the software that can be assessed for quality before code generation begins.
  - The documents must be prepared and stored as a part of software configuration.
  
  Code generation
  - This step translates the design into a machine readable form.
  - If design is performed in a detailed manner, code generation can be accomplished mechanistically.
  
  Testing
  - Once code has been generated, program testing begins.
  - This process focuses on the logical internals of the software, assuring that all statements have been tested, and on the functional externals – that is, conducting test to uncover errors and ensure that defined input will produce actual results that agree with required results.
  
  Maintenance
  - Software will undergo change after it is delivered to the customer.
  - Change will occur because, errors have been encountered or to accommodate changes in its external environment (e.g. change in device) or customer requires functional or peripheral enhancement.

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