The Free On-line Dictionary of Computing (30 December 2018):

Constructive Cost Model
COCOMO

    (COCOMO) A method for estimating the cost of a
   software package, proposed by Dr Barry Boehm.

   The Basic COCOMO Model estimates the effort required to develop
   software in three modes of development (Organic Mode,
   Semidetached Mode, or Embedded Mode) using only DSIs as an
   input.  The Basic model is good for quick estimates.

   The Intermediate Model extends the Basic Model with an Effort
   Adjustment Factor (EAF) and different coefficients for the effort
   equation.  The user supplies settings for cost drivers that
   determine the effort and duration of the software projects.  It
   also allows DSI values and cost drivers to be chosen for
   individual components instead of for the system as a whole.

   The Detailed COCOMO Model uses effort multipliers for each phase
   of the project and provides a three-level product hierarchy and
   has some other capabilities such as a procedure for adjusting the
   phase distribution of the development schedule.

   ["Software Engineering Economics", B. Boehm, Prentice-Hall,
   1981].

   (1996-05-29)