A method, implemented in a computer system including a processor and a memory, for assessing message interoperability between a first platform and a second platform communicating over a link, the method comprising the steps of: obtaining first platform model data representing platform-specific message transmit/receive information over the link for the first platform; obtaining second platform model data representing platform-specific message transmit/receive information over the link for the second platform, and using the first platform model data and the second platform model data to assess message interoperability between the first platform and the second platform; the method being characterized in that said link is a Tactical Data Link, TDL, and by comprising the steps of: parsing, using said computer system, data derived from at least part of a standards document relating to the TDL to generate at least one model template based on to the TDL standards document; parsing, using said computer system, Actual Platform Implementation Specification data associated with said first platform against said model template to generate said first platform model data; parsing, using said computer system, Actual Platform Implementation Specification data associated with said second platform against said model template to generate said second platform model data; and performing said assessment of message interoperability between the first platform and the second platform using a message interoperability assessment tool in the computer system configured to: - analyse said first and second platform model data by comparing therein respective communication characteristics of said first and second platforms to determine whether said second platform is capable of receiving at least one message type sent by said first platform in order to determine the message interoperability, and - output a report representative of said analysis. obtaining first platform model data representing platform-specific message transmit/receive information over the link for the first platform; obtaining second platform model data representing platform-specific message transmit/receive information over the link for the second platform, and using the first platform model data and the second platform model data to assess message interoperability between the first platform and the second platform; the method being characterized in that said link is a Tactical Data Link, TDL, and by comprising the steps of: parsing, using said computer system, data derived from at least part of a standards document relating to the TDL to generate at least one model template based on to the TDL standards document; parsing, using said computer system, Actual Platform Implementation Specification data associated with said first platform against said model template to generate said first platform model data; parsing, using said computer system, Actual Platform Implementation Specification data associated with said second platform against said model template to generate said second platform model data; and performing said assessment of message interoperability between the first platform and the second platform using a message interoperability assessment tool in the computer system configured to: - analyse said first and second platform model data by comparing therein respective communication characteristics of said first and second platforms to determine whether said second platform is capable of receiving at least one message type sent by said first platform in order to determine the message interoperability, and - output a report representative of said analysis. parsing, using said computer system, data derived from at least part of a standards document relating to the TDL to generate at least one model template based on to the TDL standards document; parsing, using said computer system, Actual Platform Implementation Specification data associated with said first platform against said model template to generate said first platform model data; parsing, using said computer system, Actual Platform Implementation Specification data associated with said second platform against said model template to generate said second platform model data; and performing said assessment of message interoperability between the first platform and the second platform using a message interoperability assessment tool in the computer system configured to: - analyse said first and second platform model data by comparing therein respective communication characteristics of said first and second platforms to determine whether said second platform is capable of receiving at least one message type sent by said first platform in order to determine the message interoperability, and - output a report representative of said analysis. - analyse said first and second platform model data by comparing therein respective communication characteristics of said first and second platforms to determine whether said second platform is capable of receiving at least one message type sent by said first platform in order to determine the message interoperability, and - output a report representative of said analysis.