Education has been regarded as one important aspect to reach human capital development. Several aspects of education have been researched, and an important part of them have focused on the effectiveness that teachers training programmes have over improving students' learning outcomes and improving teachers' pedagogical and methodological skills. The following report provides an evaluation of the educational assessment that Educafrica, a Chilean NGO, provided for Destiny and Saint Martin's School, two low-cost private schools located in Mathare and Kibera slums in Nairobi, Kenya. The teachers' training programme that Educafrica were designed and implemented considering some relevant findings and suggestions that different studies have made regarding teachers' training strategies, which basically points out the importance of addressing real needs of participants. An analysis of the effects over teachers and students is done, as well as the indication of some suggestions to improve the way these workshops should be implemented. At the same time, the final part of this report presents an evaluation of the goals related to the increase in teachers' effectiveness in the use of instructional time, which together with the training in methodological strategies were the main objectives of the Educafrica's intervention in both schools. [This report was produced by Eduafrica Foundation.]