Sub-Models of COCOMO Model

1. End User Programming

Application generators are used in this sub-model. End user write the code by using these application generators. For Example, Spreadsheets, report generator, etc.

2. Intermediate Sector

• Application Generators and Composition Aids: This category will create largely prepackaged capabilities for user programming. Their product will have many reusable components. Typical firms operating in this sector are Microsoft, Lotus, Oracle, IBM, Borland, Novell.
• Application Composition Sector: This category is too diversified and to be handled by prepackaged solutions. It includes GUI, Databases, domain specific components such as financial, medical or industrial process control packages.
• System Integration: This category deals with large scale and highly embedded systems.

3. Infrastructure Sector

This category provides infrastructure for the software development like Operating System, Database Management System, User Interface Management System, Networking System, etc.

COCOMO-II is the revised version of the original Cocomo (Constructive Cost Model) and was developed at the University of Southern California. It is the model that allows one to estimate the cost, effort, and schedule when planning a new software development activity.