Concept selection could based also external decision. Concepts are turned over to the company marketing team,customer, client, or some other external entity for selection. Second method is verifying concepts to company design archetypes which are coming hero products and defining company aims and strategy in near future. 

Third method is based pure intuition. The concept is chosen by its feel. Explicit criteria or trade-offs are not used. The
concept just seems to best. Last methods is multivoting. Each number of the team votes for several concepts. The concept with the most votes is selected.