In Kaduna Polytechnic as indeed in all the tertiary institutions in Nigeria assessment is school based . Semester scores are earned from continuous assessment ( C A ) and examination.While particular attention is paid to the conduct of examination by way of involving external moderation in order to ensure the standard of its questions and making, in the case of C. A .individual lectures are left to conduct it by themselves, they set the questions and mark the scripts single handedly whereas C. A. scores for each semester is forty marks which we consider significant because the basic pass marks in all courses is forty marks. This paper addresses the idea of also standardizing the C. A. component of school based examination through teacher collaboration.To do this, a sample was randomly obtained and essay test was administered The scripts were reproduced and first marked individually by these researchers using a self drawn marking guide and then a third marker was obtained to mark the scripts with a marking guide drawn up by both researchers.The scores of the scripts were analyzed using their mean score.Findings show that if lecturers collaborate to mark students C. A. scripts,students would be assessed more fairly in C. A. and standard maintained.It was recommended that lecturers collaborate by working in teams of three to four to set C. A. questions and marking guide. Such questions should cover all the units in the syllabus.Chief Lecturers / Principal Lecturers can then internally moderate all C. A. scores to ensure standard is maintained.