This document aims to provide guidance for those who want to achieve Interoperability for their ATM Validation Platforms. It refers to EUROCAE ED-147A ATM Validation Platforms Interoperability Specification [ED-1]. The document complements ED-147A [ED-1] by proposing a common collaboration model that aims to support ATM Validation Platform stakeholders to reach their goal of working together in a collaborative way. It provides examples and best practices from validation exercises using Interoperable ATM Validation Platforms from different ATM Domains.