Mythical Man Month
T=Enp+bn+cn(n1)2+pS

T = calendar effort (in months)
E = total effort (in man-months)
n = Number of people working on the project
p = Degree of partitionability (where 0 = not partitionable, and 1 = totally partitionable)
b = base training/ramp-up time (months per person)
c = average intercommunication overhead between two people (in months/person*person)
S = base sub-task communication overhead (in months)