Assessment for learning

1. QUALITIES OF A
GOOD TEST

2. • A test is the major and most commonly used
instrument for the assessment of cognitive
behaviors.
• An achievement test is a test of developed
skill or knowledge.
• The most common type of achievement test
is a standardized test developed to measure
skills and knowledge learned in a given grade
level, usually through planned instruction,
such as training or classroom instruction

3. A good test possess the following
qualities.....
• Objectivity
• Objective Basedness
• Comprehensiveness
• Validity
• Reliability
• Discriminating Power
• Practicability
• Comparability
• Utility

4. 1.Objectivity
• A test is said to be objective ,if it is free from
personal bias.
• Objectivity of a test can be increased by adding
more objective type test items.
2.Objective Basedness
• A test should be based on predetermined
objectives.
• Objective weightage should be in accordance with
the design

5. 3.Comprehensiveness
• A test should cover the whole syllabus
• It should cover all the anticipated objectives
• Importance should given to all learning materials.
4.Validity
• A test is said to be valid if it measure what it
intends to measure
• Validity is a more test-dependant concept
• A test is valid if it measures what we want it to
measure

6. Types of validity……
• Content Validity - refers to the extent to which the content of a
test's items represents the entire body of content to be
measured.
• Operational Validity -If the task required by the test are
sufficient to evaluate and measure the defined activities .
• Predictive Validity - assesses the extent to which the scale or
test predicts future behavior or performance
• Scholastic Aptitude Test (SAT) is an example of test used to
predict future performance, whether degree of success in
college can be predicted or not
• Construct Validity - refers to theoretical concepts about certain
human traits, capabilities and processes that can be observed
directly.

7. 5.Reliability
• It refers to the degree of consistency
• It is the consistency of a measure, by getting the
same result through repeated Inquiry process
• If a test is not reliable ,it cannot be valid.
Methods to determine reliability of a test …..
A.Test –retest method
• A test is administered twice to the same group
with a short interval in between
• To assess the consistency of a test across time

9. B.parallel-forms method –
Administration of two alternate forms of the same
measurement device and then comparing the scores
Example:Administer Test A to a group and then
administer Test B to same group; then correlate the
two scores as estimate of the test reliability

10. C.split-half method –
• It does not require two administrations of the same
or an alternative form test;
•Here total number of items is divided into halves,
and a correlation taken between the two halves
which only estimates the reliability of each half of
the test
• use a statistical correlation to estimate the
reliability of the whole test, such as Spearman-
Brown formula

12. 6.Discriminating Power
•The degree to which the single item separates the superior
from the inferior individuals in the trait or group of traits
being measured.”
•The discriminatory power may be defined as the extent to
which success and failure on that item indicate the possession of
the trait or achievement being measured
The discriminating power may be considered at two level
 For the whole test
 For each items

13. 7. Practicability
•Consider economy of time ,Effort , No.of personnel
and Finance required
8.Comparability
•The test scores obtained can be interpreted in terms
of a common base
9.Utility
•A test has utility if it provides the test conditions
that would facilitate realization of the purpose.