Static-type software works strictly according to defined specifications & solutions

Discussion

• Nirja Shah   -Posted on 06 Oct 15
  Software Evolution Laws
  
  - The laws for software evolution were laid down by Lehman. He divided the software into three different categories:
  
  S-type (static-type)
  - This software works strictly according to the defined specifications and solutions.
  - The solution and method required to achieve it, are immediately understood before coding.
  - This software is least subjected to changes hence it is called the simplest of all software.
  - For example, calculator program for mathematical computation.
  
  P-type (practical-type)
  - This software consists of a collection of procedures.
  - It is defined by exactly what procedures can do.
  - In this software, the specifications is described but the solution is not obvious instantly.
  - For example, gaming software.
  
  E-type (embedded-type)
  - This type of software works closely as the requirement of real-world environment.
  - It has a high degree of evolution as there are various changes taking place in laws, taxes etc. in real world situations.
  - For example, Online trading software.

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