The efficiency of software development (i. e. to produce good software products based on an efficient software process) must be controlled by a quantifi- cation of the software development methodologies. This is a main aspect in order to keep a successful method/technology change on the area of the mainte- nance as method adaptation. The descriptions of object-oreinted (OO) methods are usually given by a listing of their features. These presentations describe the funtionality of a particular development method, but often fail to address quality issues like efficiency, maintainability, portability, maturity etc. This paper describes the evaluation of technology change related to OO development methods. It reasons the appli- cability of metrics-based evaluation as indicator for the quality assurance of the OO development process.