Firms should not outsource the resources and capabilities that are key to a competitive advantage. Outsourcing should also be avoided when the number of suppliers is too small. On the other hand, outsourcing is a good way to transfer risks to suppliers when uncertainty is high.
BARTHELEMY, J. (2007). Externaliser pour innover: trois approches à connaître. In: L'art de l'innovation. 1st ed. L'Harmattan, pp. 51-56.