BIAD is an constantly growing decentralized archaeological database. Its geographic scope is currently predominantly Europe, however it continues to expand beyond this, and will become global. BIAD is a relational MySQL database, and this wiki provides all documentation for its use and ongoing development.
BIAD is not open access, and a key principle to ensure constant growth is that it can only be used by data contributors. It has strict fair usage policies that are governed by a decentralized committee of data contributors.
If you would like full access to BIAD you will need to make a commitment to upload a substantial amount of new data to BIAD. Typically this involves either novel archaeological data, or more commonly aggregating data from published site reports. You can propose this to the current BIAD committee, and if successful you will be invited to become a permanent committee member and receive direct ongoing technical support for data access and input.