1. Principles of Language Assessment
Practicality
Reliability
Validity

2. Practicality An effective test is practical
It is not excessively expensive.
It stays within appropriate time constraints.
It is relatively easy to administer.
It has a scoring or evaluation procedure that is specific and time efficient.

3. Reliability A reliability test is consist and dependable.
If the test is given to the same student or matched student on two different occasions, the test should yield the similar result.
Factors contribute to the unreliability of a test:
- Student-Related Reliability
- Rather Reliability
- Test administration Reliability
- Test Reliability
Unreliability may also result the conditions in which the test is administered.

4. Validity
Validity is the extent to which inferences made from assessment results are appropriate, meaningful, and useful in terms of the purpose of the assessment.
A valid test of reading ability actually measures reading ability, nor previous knowledge in a subject, nor some other variable of questionable relevance.

5. These five types of evidence that can support validity:
Content-Related Evidence
Criterion-Related Evidence
Construct-Related Evidence
Consequential Validity
Face Validity

6. Thanks for your attention