Final answer:
Equivalent form reliability is a method to evaluate reliability by developing a second measurement instrument that is equivalent to the first and administering it to the same subjects.
Step-by-step explanation:
The method to evaluate reliability in which a second measurement instrument is developed that is equivalent to the first and then administered to the same subjects is called equivalent form reliability. Equivalent form reliability is a type of reliability that assesses the consistency of measurements by comparing two forms of a test that are intended to measure the same construct. By administering both forms to the same subjects, researchers can determine if the two forms produce similar results, indicating a high level of reliability.