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The researcher conducted the study to plan and construct the achievement test in Biology for 9th grade students. Initially a draft of 200 test items was developed on different topics of two units selected from 9th grade biology. After incorporating suggestions of experts required for the improvement of the test items, the initial draft was reduced to 160 items. Finally test blueprint includes 120 test items on the basis of criteria initially devised by the researcher. The purpose of preparing table of specification is to assign due importance to various topics and sub-topics with respect to different levels of cognitive domain.