RSA 273-C:9 Determining Bargaining Unit.

I. The board or its designee shall determine the appropriate bargaining unit and shall certify the exclusive representative thereof when petitioned to do so under RSA 273-C:10. In making its determination the board should take into consideration the principle of community of interest. The community of interest may be exhibited by one or more of the following criteria, although it is not limited to such:
(a) Employees with the same conditions of employment.
(b) Employees with a history of workable and acceptable collective negotiations.
(c) Employees in the same historic craft or profession.
(d) Employees functioning within the same organizational unit.
II. The board may certify a bargaining unit composed of professional and non-professional employees on