- Observed Score
The actual score a student earns on a test. The observed score differs statistically from the students true score by the standard error of measurement.
- OCM
Oral Counting
- Open-ended Item
See constructed-response item.
- Out-of-level Testing
The administration of a level of a test to students at a level (age or grade) other than that for which the test was designed. For example, a fourth-grade student given a test designated for use in the fifth grade.