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The SLIM Software Lifecycle Management
demonstrating the software equation

Reference: Measures for Excellence ,Putnam L.H. and Myers W., YOUDON Press, 1992
Softwareentwicklung nach Mass, Dumke R., Vieweg Verlag, p. 55, 1992

INTRODUCTION

The SLIM (Software-Lifecycle-Management)-Method has been developed by Putnam. It estimates the effort of the software lifecycle starting with the implementation phase. According to Putnam the software lifecycle curve is estimated by the equation:

ý - effort at time t in man years
K - total effort over the lifetime in man years
td - development time in years
t - time (in years) ý is estimated for

To estimate the develoment effort, Putnam derives the relationsship among effort K, the development time td and the State of Technology Ck as the SOFTWAR EQUATION:

For the constant factor Ck the following example values have been found:

8 -	for systems with many interactions
15 -	for stand-alone systems
27 -	for subsystems

The ratio among the develoment time and the used manpower is dependent from the kind of development. The following diagram shows four sample dependencies:

Press Button to see the visualisation!

If you want to do some some calculations and see the corresponding life cycle curve ... GO JAVA !!!

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Last modified: Tuesday, 01-Feb-2000 08:42:57 CET