194 Requirements Engineering for Software and Systems
Other drivers include
requirements understanding ◾
architecture complexity ◾
level of service requirements ◾
migration complexity ◾
technology maturity ◾
which are ranked using a Likert scale.
Finally, cost drivers based on team characteristics include
stakeholder team cohesion ◾
personnel capability ◾
personnel experience/continuity ◾
process maturity ◾
multisite coordination ◾
formality of deliverables ◾
tool support ◾
which are also rated on a likert scale.
COSYSMO is quite new, but it is already being used in a number of major
corporations (Boehm et al. 2003).
Estimating Using Function Points
Function points were introduced in the late 1970s as an alternative to metrics based
on source line coun