I want to assure consistency in my leadership group so I assess them by administering my leadership scale several different times throughout the semester. I am assessing reliability with

Internal consistency

Explanation:

Internal Consistency

Internal consistency is a measure of reliability. Reliability refers to the extent to which a measure yields the same number or score each time it is administered, all other things being equal. It can be said to be an assessment of how reliably survey or test items that are designed to measure the same construct actually do so. The act of assessing severally is an act of internal comsistency.

Test-retest reliability

Explanation:

Test-retest reliability sometimes referred to as retest reliability or repeatability. It refers to the test that measures consistency over time or can also be referred to the test of reliability or consistency measured over time.

The test - retest reliability is usually given to the same set of people at different times to determine if the result will be the same at the different times. The test result at the different times are usually correlated to evaluate the test of consistency over time.