Product attributes a.
Typical values for EAF range from 0.9 to 1.4. The coefficient a i and the exponent b i are given in Table 2. This is not as precise as we might like, but it is accurate enough to provide a good deal of help in software engineering economic analysis and decision making. Boehm, B., Software Engineering Economics, Prentice-Hall, 1981. Putnam, L. and W. Myers, Measures for Excellence, Yourdon Press, 1992.