Working teams for building a data base for the project of Hajj and the Two Holy Mosques Encyclopedia are steadily working under the supervision of King Abdul-Aziz Foundation for Research and Archives for the completion of the project within three years. The working teams are collecting data from historical sources from all Muslim countries and the rest of the world about Hajj and the history of the Two Holy Mosques from the pre-Islamic era up to the current time. Workshops were held in the Kingdom of Saudi Arabia, Morocco and Malaysia for this purpose. --MORE