Too Long; Didn't Read
The two most popular models were the Fixed Price and Time and Material. Fixed price approach appeals to inexperienced customers. Time and materials contract allows developers to work without regard to financial constraints. Fixed-budget, scope-controlled strategy presupposes close cooperation with a client. The key to choosing an efficient project pricing model is information and to make the right decision, a client should ask himself the right question: "Am I ready for taking risks? Am I concerned with what you are most concerned with"?