Prior to making any determination to order a reassessment or a new assessment under RSA 71-B:16, III, the board shall give notice to the selectmen or assessors of the taxing district and, if requested, hold a hearing on the matter at which the selectmen or assessors shall have the opportunity to be heard. The board shall not order any such reassessment or new assessment unless it determines a need therefor utilizing the following criteria:
I. The need for periodic reassessment to maintain current equity.
II. The time elapsed since the last complete reassessment in the taxing district.
III. The ratio of sales prices to assessed valuation in the taxing district and the dispersion thereof.
IV. The quality of the taxing district's program for maintenance of assessment equity.
V. The taxing district's plans for reassessment.