Full context:   Many theories and practices exist with respect to improvement in business. For example, business process improvement is a systematic approach to help an organisation optimise its underlying processes to achieve more efficient results. One such approach is focused improvement, the ensemble of activities aimed at elevating the performance of any system, especially a business system, by working on eliminating its constraints one by one while not working on non-constraints. Performance improvement focuses on measuring the output of a particular business process or procedure, then modifying the process or procedure to increase the output, increase efficiency, or increase the effectiveness of the process or procedure. Quality improvement is one of the four aspects of the concept of quality management. A crucial component of professional development is evaluation. Recently, we have seen a push for evaluation systems to be used to sort and fire teachers—a supposed quick fix, but one that ignores the vast majority of dedicated educators. To be effective, an evaluation system must identify strengths and weaknesses, so that all teachers can get the necessary support to improve their practice.