Incremental

“Incremental development is a staging and scheduling strategy in which various parts of the system are developed at different times or rates and integrated as they are completed. … The alternative strategy to incremental development is to develop the entire system with a big-bang integration at the end.” - http://www.se.rit.edu/~swen-256/resources/UsingBothIncrementalandIterativeDevelopment-AlistairCockburn.pdf