Educational leaders need to be able to evaluate the effectiveness and impact of educational programs, policies, and instructional activities in their schools and school systems. The experiences and perspectives of stakeholders matter in an attempt to understand the state of affairs of teaching and learning situations, programs, policies and interventions, and other activities in the schools and educational systems. The review strongly situates qualitative research as an option in evaluation research, especially in the field of education. A qualitative evaluation has the potential of leading to a consultative understanding and review of school programs and situations and provide an authentic basis for interventions aimed at school improvement. School leaders, especially the principals/school heads and other personnel who are part of the school leaders need to understand qualitative evaluation research, its place in education and school administration, and how it can be utilized to support school improvement efforts.

Globally, education, whether formal or informal, is perceived as development and language is the major medium of instruction and communication through which innovations, ideas, views and opinions are transmitted from one person to another, institution to institution, and country to country. The study aims to investigate the relationship between English language as a medium of instruction and students’ academic performance in selected secondary school in Temeke municipality in Tanzania. The study used descriptive research design, the study used Slovene's Formula to obtain sample size of  148 respondents including students and teachers from the target population of  237 students and teachers ,structured questionnaire was   used to collect primary data, data was analyzed using descriptive statistics included measures of central tendencies (mean) and measures of dispersion (standard deviation, the finding of the study   concluded that the use of English as a medium of instruction in secondary schools seems to be challenge both  to students due to majorities are not able to read, write, speak, listen and understand the content delivered in English language but  most prefer the use of Swahili language  and recommended that government in relation to educational stakeholders needs also to establish cultural behavior of using English language in our society as well as in schools so as to influence subject content performance to meet the global market of using English language.