Hea metoodika kaalude saamiseks annab aga nn analüütiliste hierarhiate meetod (ingl Analytical Hierarechy Process, AHP), mis võimaldab vajalikud kaalud leida ekspertide poolt kriteeriumide olulisusele paarikaupa antud hinnangute alusel.
A well-established procedure for assigning weights to a set of factors, which may correspond to the layers of overlay, is Saaty's Analytical Hierarchy Process (AHP), which builds a matrix of pairwise comparisons (ratios) between the factors.
The technique described here and implemented in IDRISI is that of pairwise comparisons developed by Saaty (1977) in the context of a decision making process known as the Analytical Hierarchy Process (AHP).
