Validity
What does validity mean?
A test measures what it should
What is reliability?
Consistent test results
What is practicality?
Easy to give and mark
A test that measures speaking only with multiple-choice
Poor validity
Validity
Measures the correct skill
Give an example of poor validity
A grammar test for speaking
Example of a reliability problem?
Same student gets different scores
Example of poor practicality?
Very long test for 100 students
Same student scored differently on 2 tests.
Reliability problem
Reliability
Consistent results
Why is validity important?
Ensures fair assessment
Why is reliability important?
Makes results trustworthy
Why is practicality important?
Teachers have limited time/resources
Test takes 3 hours for 1 class.
Practicality problem
Practicality
Easy to give and mark
What happens if a test is valid but not reliable?
Scores are inconsistent
How to improve reliability?
Clear instructions, scoring rubric.
How to make a test practical?
Shorten it, reduce cost, simplify scoring
A grammar test that checks grammar and vocabulary
A grammar test that checks grammar and vocabulary Valid and practical
Assessment
Way to measure learning
Name 2 ways to improve validity
Match tasks to objectives; use real-life tasks
Difference between reliability and validity?
Validity = correct skill; Reliability = consistent results
Example of valid & reliable but not practical?
Individual speaking test for 100 students
A speaking test for large class, takes long time.
Reliable and valid but not practical
Good test
Valid, reliable, and practical