A method and a corresponding apparatus are described, where the method includes storing, in a processing system, an information set that includes a plurality of items in hierarchical relationships, each of the items containing information. The plurality of items are grouped to form a plurality of subsets of the information set. One of the plurality of subsets is identified, for which a known memory availability limit will not be exceeded when a predetermined test is subsequently performed on the identified subset. The predetermined test is then performed on the identified subset. The identification of a subset and performing of the predetermined test may be repeated for different subsets of the information set, so that all of the subsets in the information set have been tested.