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:According to above points we need to have specific rules or formulas by which we easily calculate execution time as well as effort and time at deployment process but before they can guarantee a successful installation, producers must be able to determine what components are available at a given site, as well as the configuration of those components [7].
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