Software that uses machine logic to identify expert(s) for functional components of source code, determining a confidence value for each functional component based on the availability of its respective expert(s), by performing the following steps: (i) receiving a first functional component of a set of source code; (ii) receiving a set of knowledgeable person(s) information including identifying information for at least one person and respectively associated availability information for each identified person, where each person identified in the set of knowledgeable person(s) information has knowledge of the first functional component; and (iii) calculating, based, at least in part, on the identified person(s) and their respectively associated availability information, a confidence value for the first functional component relating to the availability of person(s) with knowledge of the first functional component.