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This research studies a large company’s selection control system for start-up complementors. A start-up complementor is a young, innovative company with the resources and skills to enable it to complement a large company’s value proposition through collaboration. Our analysis of a start-up complementor selection unit, within IBM France, led us to identify a selection control system with four elements: attraction measures, a process that is both bureaucratic and flexible, formal and informal selection criteria, and a team of complementary selectors (a genius, a chameleon, an expert, and a sponsor). This system is “double-sided”: adapted to the large company on one side, and to start-ups on the other. It appears to create the conditions for the strategic fit required for complementor engagement in the collaboration. This research suggests that strategic fit is a control problem that, like cooperation and coordination problems, must be considered in the development and implementation of the selection control system.