Professions develop around the delivery of specialized services. Lawyers give legal advice, electricians install wiring, and teachers provide education. At some point in the evolution of a field, licensure or certification defines its area of expertise. Licensure is a legal entity allowing only certain people to perform a task. Certification is a non−legally binding designation that informs consumers of qualifications. Frequently, licensing and certification are performed by professional organizations that oversee education, training/apprenticing, and evaluation through examination.