Evaluating Impact - Creating Data Collection Tools Flashcards
What are the key decisions that need to be made when creating data collection tools?
- the purpose of the evaluation instrument
- what will and will not be included in it
- the type of evaluation to use
- how to isolate the data to make valid comparisons
- determine control groups
- get management support and overcome barriers
What are some tools that test knowledge, and what is important to remember about them?
Exams, assessments, and tests
They may not be the best way to test knowledge.
Validity
the evaluation instrument measures what it was intended to measure
Important because it ensures all learners interpret the meaning of a test question the way it was meant
How do you verify validity?
Solicit feedback from a subject matter expert
5 ways to determine whether an instrument is valid
- content validity: the extent to which the instrument represents the program’s content
- construct validity: the degree to which the instrument represents the construct it’s supposed to measure (the construct is the abstract variable that should be measured, such as knowledge or skill)
- concurrent validity: the extent to which an instrument agrees with the results of other instruments administered at approximately the same time to measure the same characteristics
- criterion validity: the extent to which the assessment can predict or agree with external constructs; determined by looking at the correlation between the instrument and the criterion measure
- predictive validity: the extent to which an instrument can predict future behaviors or results
Test validity boils down to 2 things
- the test should be reasonably reliable and free from measurement errors
- the test should include all of the content that is needed to perform the job safely and competently
Reliability
the ability of the same measurement to produce consistent results over time
How do you determine reliability?
- the instrument must be administered to a sample of participants and undergo statistical analysis; should have reliability coefficients at or above 75%
- non-scientifically, it can be determined and improved by wording questions and evaluating responses over time
What are the possible consequences if a test is too easy?
poor job performance, on the job accidents, damage to expensive equipment
What factor maximizes test validity and test reliability?
the degree of difficulty
What could a test that seems to have a low degree of difficulty indicate?
Testers knew the information already, the test was too easy, or the answers were cued in some way
What could a test that seems to have a high degree of difficulty indicate?
information wasn’t presented adequately in person or in reading materials or the item was so difficult only the most knowledgeable could answer it
What are two ways to test reliabilty?
Split-half reliability, test-retest check of reliability
Split half reliability
Two groups of testers take half of the test; the correlation of results is calculated. Then the group takes the other half as their re-test.
Test-retest check of reliability
The same test is administered twice to the same group of people