Deliverable 2.4: Methodologies, compatibility, re-usability. This document describes the work currently in progress within the Virtual Museum Transnational Project (V-MUST.NET), and specifically within the Second Work Package (WP2), dedicated to the establishment of users’ requirements and criteria analysis in the Virtual Museum domain. This deliverable describes how Virtual Museums and Research Institutions, members of the network, are currently dealing with issues related to methodologies, compatibility and re-usability when developing Virtual Museums (VMs). The objective here is not to directly suggest solutions, since this is the scope of other work packages. Conversely, the main objective of this deliverable is to provide a practical view on the consortium member’s practices, experiences and preferences regarding the above-mentioned topics and emphasize on implemented practices. This document under the above perspectives will feed and be generally used as reference by other consortium members when developing the Platform (WP4) and the Common Implementation Framework (WP5).D2.4b is the updated document, released in 2013.