13 Building Theories from Multiple Evidence Sources checked Approaches which are explicitly open for users are rated with awhile a − indicates approaches that operate as more of a black-box (end users are guaranteed only to seethe inputs and outputs).
2.2.8. CostThis is the last but definitely not the least important attribute in our list. Cost expresses the level of time and effort investment necessary to get results. Regardless of the
benefits that can be achieved, some approaches may require substantial work to produce and document the results. In such cases we clearly flag them with awhile approaches with a + have exactly the opposite meaning, namely they are relatively cheap to apply.
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