If there are stringent reliability on the software product, this initial estimate is scaled upwards. For example, if modern programming practices are used, the initial estimates are scaled downwards by multiplying with a cost driver having a value less than 1. The intermediate COCOMO model recognizes this fact and refines the initial estimate obtained by the basic COCOMO by using a set of 15 cost drivers (Multipliers). Therefore, in order to obtain an accurate estimation of the effort and project duration, the effect of these parameters must be taken into account. however, it is intuitively obvious that a host of other project parameters besides product size affect the effort and development time. The basic COCOMO model assumes that the effort and development time are functions of the product size along.
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