Split-Half Reliability: This type of reliability estimates the consistency between two halves (or portions) of the same test by comparing performance on each half separately.
Parallel Forms Reliability: It refers to the extent to which different versions or forms of a test produce similar results when given to the same group of individuals.
Alternate Forms Reliability: Similar to parallel forms reliability, alternate forms reliability measures how consistent scores are across different versions or forms of a test but usually involves administering both versions at separate times.