This is one of 14 country studies which together with a final volume of summary and analysis will comprise a comprehensive Report on the Supply of Secondary Level Teachers in English-Speaking Africa. Each study is focused on the problem of determining the likely demand for overseas personnel for staffing secondary level institutions through 1975. Each gives a short description of the country's geographic, economic, and political situation; traces the development of secondary education and makes projections for the future; assesses the present and future supply of secondary level teachers in each field; and draws conclusions as to the resulting demand for expatriate secondary level teachers. A final chapter draws implications and makes recommendations for long-range planning. The Sierra Leone study emphasizes that although the country trains enough teachers, a low retention rate causes a need for expatriate personnel. This need is greatest in secondary level mathematics and science. (Other studies in the series are SP 004 605 and SP 004 607 - SP 004 612.) (RT)