Tools and Techniques for Requirements Engineering and Management - Requirements Engineering and Management for Software Development Projects - page 171

Fig. 13.1 Waterfall model

SSADM uses the waterfall method as software development life cycle.
Figure 13.1 depicts the waterfall model pictorially. The waterfall model originally
had five phases, namely, Requirements, Design, Implementation, Verification, and
Maintenance. But since the original definition, organizations made many modifi-
cations to this model and many variants are found in the organizations. SSADM
lays emphasis on rigorous documentation as the basis for the software develop-
ment. This emphasis, in fact, has originated in the manufacturing model used in
project type of manufacturing organizations.
Let us discuss the stages of SSADM as popularly used in many organizations,
in a little greater detail.