The initial version of
COCOMO II provides a simple schedule estimation capability similar to those in
COCOMO 81 and Ada COCOMO. The initial
baseline schedule equation for the COCOMO II Early Design and Post-Architecture
stages is:
Eq.
14
In Equation 14, C is a
TDEV coefficient that can be calibrated, PMNS is the estimated PM excluding the SCED effort multiplier as
defined in Equation 1, D is a TDEV scaling base-exponent that can also be calibrated. E is the effort
scaling exponent derived as the sum of project scale drivers and B as the
calibrated scale driver base-exponent (discussed in Sections 3.1). SCED% is the
compression / expansion percentage in the SCED effort multiplier rating scale
discussed in Section 3.2.1.
Time to Develop, TDEV, is the calendar time in months between the estimation end points
of LCO and IOC for MBASE/RUP or SRR and SAR for Waterfall lifecycle models (see
Section 6.2). For the waterfall model, this goes from the
determination of a product’s requirements baseline to the completion of an
acceptance activity certifying that the product satisfies its
requirements. For the MBASE/RUP model
discussed in [Boehm et al. 2000], it covers the time span between LCO and IOC
milestones.
As COCOMO II evolves, it will have a more extensive schedule estimation model, reflecting the different classes of process models a project can use. The effects of reusable and COTS software; the effects of applications composition capabilities; and the effects of alternative strategies such as Rapid Application Development are discussed in [Boehm et al. 2000; also at http://sunset.usc.edu/COOCMOII/suite.html].