Objectivity:
Objectivity means freedom from bias. A test should yield a clear score value for each performance, the score being independent of the personal judgment of the score.
Economy:
Tests that can be given in short period of time are likely to gain the cooperation of the subject and to conserve the time of those involved in test administration. The matter of expense is also a significant factor. vi) Practicability Simplicity of administration, scoring and interpretation are important factors in selecting test.
Interest:
Both the researcher and subjects should enjoy the experience of data collection. The investigator gains cooperation of subjects if responding to an instrument is interesting and enjoyable, and the measuring tool may not yield useful results if they are dull or seem silly (foolish).