To prevent the child's mind from becoming stagnant
To obtain an objective measure of a child’s intelligence in comparison with all other children of his age
To retain funding for an educational establishment
Chronological age divided by Mental age, all multiplied by 100
Mental age multiplied by Chronological age, all divided by 100
Mental age divided by Chronological age, all multiplied by 100
Tests may be too difficult.
There may be test items that could mean different things to different people.
Language barriers often present a problem.
Scoring may be too subjective.
Tests may be too short so that they do not sample abilities adequately.
They may contain printing errors.
Here's an interesting quiz for you.