In the article $(1990)$ Prahalad & Hamel $-$ The Core Competence of the Corporation, the authors present the Core Competency, a critical concept in management theory. Core Competency can be defined:

$"$as discrete businesses where capital is allocated business by business"

$"$as products or functions critical to provide outsourcing"

$"$as critical to provide potential access to narrow local markets"

$"$as a harmonized combination of multiple resources and skills that distinguish a firm in the marketplace"