The classical development methodology is called the SDLC or “system development lifecycle.” The classical development methodology is shown in Figure 5.1.
Figure 5.1 System development lifecycle
In Figure 5.1 it is seen that there is a linear progression from the early stages of design and development to the final stages. Development proceeds from one stage of development to the next in a “waterfall” manner. The next stage of development does not start until the preceding step is complete.