The Strengthening of Mathematics and Sciences in Secondary Education (SMASSE) in-service training programme was set up in 1998 as an intervention measure following the declining quality of teaching and learning in Mathematics and Sciences in Kenya. SMASSEs strategy was a pedagogical shift coined as the Activity-focused, Student- Centered, Experimenting and Improvisation (ASEI) through Plan, Do, See and Improve (PDSI) approach. This innovation has a Constructivists approach of teaching and learning. The purpose of the study was to evaluate the extent to which the SMASSE in-service training...