Indiana Code Title 21. Higher Education § 21-28-3-7

Sec. 7. ARTICLE VI. ELIGIBLE PARTIES AND ENTRY INTO FORCE. (a) The states of Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, and Wisconsin are eligible to become party to this Compact.  Additional states are eligible if approved by a majority of the compacting states.

(b) As to any eligible party state, this Compact is effective when its legislature enacts the same into law;  however, it is not initially effective until enacted into law by five (5) states prior to December 31, 1995.

(c) Amendments to the Compact shall become effective upon their enactment by the legislatures of all compacting states.