MOA is an evaluation model for implementation of IT in organisations, developed by the author. The model has been used for several evaluation studies, and has been slightly modified in order to be useful for different fields of informatics.  The MOA-E model has been used for case studies within the field of Computer-Supported Co-operative Work and implementation of e-Government. The MOA-L model has been used for case studies within the field of e-Learning at work for web-based internally developed courses. The MOA model has also been used as a scenario model (MOA-S). The basic model primarily focuses on the three different aspects work processes (from a management perspective), work situations (from the perspectives of the employees) and quality of services (or product) produced (from the perspective of the customers/clients or patients). The model has mainly been used in a process-oriented way, studying implementation and use at different stages of the development process. The aim of the paper is to describe the model and the main experiences from the use of the model. Some experiences from the use of the model are usefulness for many different fields of informatics and flexibility. The model combines simplicity and complexity in a flexible way. The focus on different perspectives of the model facilitates the design of technology, organisation (and education) leading to a “win-win”-scenario for the different interest groups, and also the evaluation of consequences for different interest groups.