Deliverable "D5.2 Beta Prototype, testing and validation data management platform report" describes the architecture and functional specifications of the WhoLoDancE platform, focusing both on the data management infrastructure of the WhoLoDancE Movement Library and the User Interface used to access the platform functionalities. Particularly, this deliverable reports on the outcomes of four main tasks of WP5 at a preliminary stage, a) T5.1 Building and deployment of data management platform, b) T5.2 Conceptual Modelling and Annotation of Data, c) T5.3 Data Modeling, integration and management, (although some details concerning the Data Management are described in D5.1 Data Management plan), as well as d) T5.7 Platform testing, validation and maintenance plan specifications. The main purpose of the WhoLoDancE Movement Library (WML) is to provide access to the repository of the multimodal recordings of the different dance genres through an attractive interface for the end-user. Section 2 provides an overview of the architecture of the platform and Section 3 the specifications of the offered functionalities. The main functionalities provided are brows, search, view/play and annotate the multimodal recordings. Through this web-based platform, the user can browse the recording by dance genre, and search by using keywords that are included in the of the metadata of the recordings. The second part of the document, Section 4, presents the testing and validation activities of the platform that have taken place during the reporting period.