24. The computer program product of claim 23 , wherein the first entity corresponds to a market research project, the second entity corresponds to a panelist, the fact vertices correspond to profile parameter vertices representing profile parameter values identified for the panelist, and the criteria vertices represent quota cells of market research projects.
30. The computer program product of claim 24 , wherein a code for selecting one of the quota cells comprises code for selecting one of the quota cells from the set at random.