We can work on SDLC and Agile both software development strategy process. Its all depend on client.
1) If client agrees on work with us then he should do 100% payment release on escrow
2) We will create Scope document cums System requirement specification documents, client need to understand it and agree with us. We will do changes as per client need.
3) Once scope document approved we will proceed to designing phase. 50% of payment should be released at that time
4) According to given tentative time line we will release demo which will be at our server, at server at that time 75% payment will be released
5) We will load demo to client server with complete testing . 100% payment will be released !