By MortazaviBlog on Sep 10, 2007
[T]here is a difference between "necessary" competencies and "differentiating" competencies. It makes little sense to define a competence as core if it is omnipresent or easily imitated by competitors ... A core competence is truly core when it forms the basis for entry into new product markets. In assessing a competency's extendability, senior management must work hard to escape a product-centric view of the firm's capabilities [and focus on a skill-centric view].
That should be a simple enough recipe to remember.