The Psion Organiser was the brand name of a range of pocket computers developed by the British company Psion in the 1980s. The Organiser I (launched in 1984) and Organiser II (launched in 1986) had a characteristic hard plastic sliding cover protecting a 6×6 keyboard with letters arranged alphabetically. The Organiser II competed with the Filofax and can be considered the first usable Electronic organizer, or Personal digital assistant (PDA) in that it combined an electronic diary and searchable address database in a small, portable device.