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:The development and test sets are from WMT 2006 shared task.1 The evaluation metric is case-insensitive BLEU (Papineni et al., 2002) as calculated by the multi-bleu.perl script.
Category: