COCOMO Model stands for Constructive Cost Estimation Model widely used in software engineering.
If E is the effort applied in person-months, D is the development time in chronological months, KLOC is the estimated number of delivered lines of code (in thousands) and ab,bb,cb,db have their useful meanings. The basic COCOMO equations are of the form
E =ab(KLOC)exp(bb), D=cb(E)exp(db)