Write down the paper which Use seven step model given as your base line. Which means you distinguish other models do not explain Methods in this paper (waterfall, rad etc...). You require to find other SDLC models, models will be called SDLC ...some may have four steps and others may have 12 steps. Analysis is focused on understanding common characteristics of models (what is the same...what is different) Can you tell me what professor is looking for?