(a) Definition: Any difference or dispute between the Board and the Unit relating to the terms of this agreement, or its interpretation, or application, or enforcement thereof, shall be subject to the following procedures, which shall be resorted to as the sole means of obtaining adjustment of disputes, which shall hereinafter be referred to as a “grievance”. As used in this paragraph the term Unit shall include:

(1) An individual employee who is a member of the Unit, or

(2) A group of employees, who are members of the Unit having the same grievance, or

(3) North Bergen Federation of Teachers, Local 1060.

(information taken from page 6(a) in the Union Contract)