An estimation model for computer software uses empirically derived formulas to predict effort as a function of LOC or FP.

Structure of the Estimation Models:-

E = A + B * ( ev )C

where: E is effort in person-months A, B, and C are empirically derived constants ev is the estimated variable (LOC or FP).

Concrete Estimation Models:-

LOC oriented models

E = 5.2 * ( KLOC )0.91

E = 5.5 + 0.73 * ( KLOC )1.16

E = 3.2 * ( KLOC )1.05

E = 5.288 * ( KLOC )1.047

FP oriented models

E = -13.39 + 0.0545 * FP

E = 60.62 * 7.728 * 10-8 * FP3

E = 585.7 + 15.12 FP