In this chapter we describe a scenario for the validation of a placement service in Learning Networks. In Chap. 12 of this volume we described placement in Learning Networks as a case of Accreditation of Prior Learning (APL). We explained that placement in Learning Networks cannot assume the availability of data or metadata that allow for a direct or indirect coupling of data, such as competence descriptions, to the outcomes of learning activities. Even though such data may be available, their semantics are unknown, since there is no controlled vocabulary in Learning Networks.