The work of internal verifiers (IVs) is integral to ensuring that the operation of vocational qualifications meets the local needs of learners and employers, while also maintaining reliable quality nationally and throughout occupational sectors. Arguably, though, the role of IVs in the management of vocational learning often remains narrowly defined and under-utilised. This article examines the benefits accruing to organizations when their employees act as IVs, as well as the benefits accruing to those who undertake the role. Drawing principally upon interview data, the article describes and classifies prevalent variations of the IV's role within workplaces, training providers and colleges. It identifies six key areas of impact in which the benefits derived from the work of IVs can be measured. The article concludes by suggesting a minimum framework necessary for IVs to impact effectively upon quality assurance, and for IVs themselves to feel professionally supported and developed.