COCOMO II Cost Drivers

Required Software Reliability [RELY]

This is a measure of the extent to which the software must perform its intended function over a period of time. If the effect of a software failure is only a slight inconvenience then RELY is set very low. If a failure would risk human life then RELY is set very high.

Rating LevelsDescriptionEM
Very LowSlight inconvenience0.82
LowLow, easily recoverable losses0.92
NominalModerate, easily recoverable losses1.00
HighHigh financial loss1.10
Very HighRisk to human life1.26
Extra Highn/a
RELY Ratings

This cost driver can be influenced by the requirement to develop software for reusability. See the description for RUSE.