Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:To assess for skills of divided attention, the measures used by Craik et al. (1996) and Naveh-Benjamin, Craik, Guez, and Dori (1998) were considered appropriate as the aims of the current study were similar to their objectives.
Category: