We, machine translation providers, as members of Asia-Pacific Association for Machine Translation (AAMT), are now establishing environments for sharing and exchanging user dictionaries among different machine translation systems. In order for users to utilize machine translation systems more effectively, we define common formats of user dictionaries, and establish electronic environments available for users to exchange their user dictionaries using these common formats. This task started in 1996, and the formats will be fixed in March of 1998.