All projects have something they need to do... deliver. But what are they to deliver!? Any business owner can come to Covenant E-design with a statement like "Make my cold-callers more efficient!" or "Increase my customers satisfaction!". Riiiight. Like Any able developer can just whip-out his trusty magic Lisa give it a good ol' rub, and POOF, satisfied clients. Statements like this need to be professionally rounded through further discussion to bring the business-owner (Sponsor) to a place of quantification.

Does one need to know other Dps before MVC?

It's a good question, and one that all OOD focused PHP'ers need to address at some point in their careers, as MVC is probably one of the most popular design patterns, if not the one with the most frameworks readily available for PHP. It is also probably the simplest, in that it directly groups the process-flow of an application into it's major components. (Singleton would be the simplest from a scripting perspective)