In-service training is an integral part of an educational system as teachers always need to update their educational and professional knowledge for a more effective teaching delivery. Ensuring the effectiveness of the in-service training programmes is, however, very challenging. In this article, we introduce the use of the CIPO model, i.e., Context-Input-Process-Output, for in-service training management. We extend the classical CIPO model by integrating into it a quality assurance process. We conduct a case study in Vietnam over a sample of 163 teachers and develop an IT training course to demonstrate how the new model can be used in teacher training management. Finally, we discuss about the lessons learned and recommendations.