Combining continuous assessment scores with external examination scores for the certification and selection of junior and senior secondary school graduates has gained currency in some countries, including Ghana and Nigeria. While the rationale behind combining continuous assessment scores with external examination scores appears to be sound, there are some fundamental issues which must be understood and addressed by policy makers and practitioners in order to make informed decisions concerning the practice. This paper addresses some relevant issues relating to the policy and practice of combining the two sets of scores for certification. The issues include differences in the quality of teacher assessments and external examinations, methods ...