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(Describe software process models and process activities (Waterfall model,…

- - - - -Operation and maintenance
        
        this is the
        longest life cycle phase. The system is installed and put into practical use.
      - -Integration and system testing
        
        The individual program units or programs
        
        are integrated and tested as a complete system to ensure that the software
        
        requirements have been met.
      - -Implementation and unit testing
        
        the software design is realized
        
        as a set of programs or program units. Unit testing involves verifying that
        
        each unit meets its specification.
      - -Requirements analysis and definition
        
        in detail and serve as a system specification.
        
        goals are established by consultation with system users. They are then defined
        
        services, constraints, and
      - System and software design
        
        systems design process allocates the requirements
        
        to either hardware or software systems by establishing an overall system
        
        architecture.