The terms "competence" and "incompetence" refer to a persons ability to understand the nature and consequences of decisions and should be restricted to describe a person´s legal status.
A person may be declared incompetent in business or financial matters but remain legally competent to consent or refuse care.
Competence is determined by a proper legal authority, usually a judge.
Storey P and Knight CF. Unipac six: ethical and legal decision making when caring for terminally ill. Reston, Virginia. American Academy of Hospice and Palliative Medicine. 1998. Page 18.
Competence is the ability of an individual to do a job properly.
A competency is a set of defined behaviors that provide a structured guide enabling the identification, evaluation and development of the behaviors in individual employees.
Some scholars see "competence" as a combination of practical and theoretical knowledge, cognitive skills, behavior and values used to improve performance; or as the state or quality of being adequately or well qualified, having the ability to perform a specific role.