The purpose of the present report is to show a comprehensive diagnosis of the situation of two low-cost private schools (Destiny and Saint Martin's schools) located in two slums (Mathare and Kibera) of Nairobi, capital city of Kenya, that Educafrica's team found before starting a collaboration programme through field volunteers work. A wide variety of instruments were used in order to collect data that captures all the complexities of schools that deals with contexts of deep scarcity of basic resources as well as challenging working conditions. Data collected and systematized was fundamental to have a proper understanding of the current ongoing educational situation in these schools, in order to articulate the best interventional framework that will help to improve the schools' performance. Several lessons are drawn after analysing the schools' normal operation regarding teachers' methodological and pedagogical practices. Challenges for achieving a desired teaching system are also highlighted, which would also frame the action course of Educafrica for the next years. [This report was produced by Eduafrica Foundation.]