areas of weakness. The information received from a diagnostics test is used to plan or modify instruction.
Although I believe both methods are effective, I would select screening tests as being most effective. My reasoning for choosing screenings over diagnostic testing, it because screening tests are where the diagnosing takes place. Screenings should be used with all children in a school in order to locate those who are delayed or at risk. It is very important for teachers to know where each of their student’s stand academically, and whether or not intervention is needed in order to improve the student’s skills.