N.J. Stat. § 18A:50-8
The boards of education of two or more school districts may provide jointly by agreement for maintaining a program of adult education and utilizing buildings, equipment and other school facilities of the participating boards for such purposes. Such agreement shall be adopted by resolution of each of the participating boards of education and shall set forth the courses which are to be offered, subject to the approval of the department; the tuition, if any, to be charged to residents of the participating districts and to persons received from other districts; provided that such tuition shall not exceed the actual cost per pupil; the personnel to be employed to administer the program; and other matters deemed necessary to carry out the purposes of the agreement.
N.J.S. § 18A:50-8