This study sought to establish teachers’ perception on the schools’ effectiveness in the development of the strategic plan, the perception of teachers on how the implementation of the strategic plan affects the academic performance and what should be done to ensure an effective strategic planning. The study used a mixed research approach while employing the convergent parallel design. The study population consisted of 2,844 stakeholders from 5 sampled schools whereby 185 respondents were drawn. The study concluded that there was effectiveness in the development of the Strategic Plan; the implementation of the strategic plan contributed to improved academic performance and various strategies were used by heads of schools to ensure that strategic plans were implemented. The study recommends that to be more effective in developing strategic plans, heads of schools should involve all stakeholders and hire experts to facilitate strategy formulations. Secondly, school heads should educate the school communities about benefits derived from effective implementation of strategic plans so that they can fully be committed to its implementation. Finally, school heads should come up with new strategies that will minimize resistance by school community members so as to speed up adoption as opposed to being pushed all the time by heads of schools in order for them to comply.