A method, system and computer-readable media are provided for performing assortment definition and planning to match the right articles, with the right stores, at the right times. The method, system and computer-readable media include receiving sales information for a plurality of stores, calculating a capacity index, assigning the calculated capacity index to each of the plurality of stores, defining a criteria level for each of the plurality of stores, categorizing the plurality of stores according to both the capacity index value and the criteria level and assigning one or more stores to the assortment based on the categorizing result.