The awarding of grades considerably reduces the inter examiner's and intra examiner's variability in assessment. Statistical studies has found that there is a variability in awarding of scores by each examiner to an extent of about 15%. Though the marking system may counter this with answer keys awarded, yet there exists irregularities from examiner to examiner as the manner of presentation which an examiner likes varies. grouping students of similar potential to bands can reduce the irregularities in assessment techniques.
Grading system can thus prove good for the educational system as it distinguishes between a real student performer and an academic