The constructive Cost model (COCOMO) is an empirical estimation model i.e. the model uses a theoretically derived formula to predict cost related factors. This model was created by “Barry Boehm”. The COCOMO model consists of three models:-
(1) The Basic COCOMO Model: It computes the effort & related cost applied on the software development process as a function of program size expressed in terms of estimated lines of code (LOC or KLOC).
(2) The Intermediate COCOMO Model: It computes the software development effort as a function of – Program size and A set of cost drivers that include subjective assessments of product, hardware, personnel, and project attributes.
(3) The Advanced COCOMO Model: It incorporates all the characteristic of the intermediate version along with an assessment of cost driver’s impact on each step of software engineering process.
The COCOMO Model is defined for three classes of software projects stated as follows:-
(1) Organic Projects: These are relatively small and simple software projects which require small team structure having good application experiences.
(2) Semi-detached projects: These are medium size projects with a mix of rigid and less than rigid requirements level.
(3) Embedded Projects: These are large projects that have a very rigid requirement level. Here the
hardware, software and operational constraints are of prime importance.
In below we will discuss only the Basic & intermediate COCOMO Models:
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