Course equivalency is the term used in higher education describing how a course offered by one college or university relates to a course offered by another. If a course at one institution is viewed as equal or more challenging in subject and course material than a course offered at another institution, the first course can be noted as an equivalent course of the second one. A course equivalency can be unilateral, meaning it is deemed equivalent by the institution where a petitioner hopes to get credit for a course taken elsewhere. Or, it could be bilateral, meaning both institutions acknowledge their acceptance of each other's course as equivalent. The methods and measures used to determine course equivalency vary by institution, state, region and country.