5 Main Characteristics of
a Good tool
Five main characteristics
of a good tool are as follows: 1. Objectivity 2. Reliability 3.
Validity 4. Norms 5. Practicability!
1. Objectivity:
The
test should be free from subjective—judgement regarding the ability, skill,
knowledge, trait or potentiality to be measured and evaluated.
2. Reliability:
This
refers to the extent to which they obtained results are consistent or reliable.
When the test is
administered on the same sample for more than once with a reasonable gap of
time, a reliable test will yield same scores. It means the test is trustworthy.
There are many methods of testing reliability of a test.
3. Validity:
It
refers to extent to which the test measures what it intends to measure. For
example, when an intelligent test is developed to assess the level of
intelligence, it should assess the intelligence of the person, not other
factors.
Validity
explains us whether the test fulfils the objective of its development. There
are many methods to assess validity of a test.
4. Norms:
Norms
refer to the average performance of a representative sample on a given test. It
gives a picture of average standard of a particular sample in a particular aspect.
Norms are the standard scores, developed by the person who develops test. The
future users of the test can compare their scores with norms to know the level
of their sample.
5. Practicability:
The
test must be practicable in- time required for completion, the length, number
of items or questions, scoring, etc. The test should not be too lengthy and
difficult to answer as well as scoring.
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