A notation of codenames and code numbers of JI members was found in a notebook recovered from Faiz Abdullah Ashiblie. Codes were used in communications among JI members. Each JI member would be assigned a code number and a codename as a security measure. Codes were also used when notifying JI members of meetings. Using the "BMTDK" model, JI members would be notified of the date, time and venue of the meeting through a series of code numbers. For example, a message such as "2320212726" would denote a meeting on the 23rd (23) of the month at 2000 hrs (20) at the residence of JI member whose code number was "21". The code number of the JI member who sent the message was "27" and the intended recipient of the message would be the JI member whose code number was "26".