* integrated, product-based granular security schema

* inter-bug dependencies and dependency graphing

* advanced reporting capabilities ·

* a robust, stable RDBMS back-end

* extensive configurability ·

* a very well-understood and well-thought-out natural bug resolution protocol

* email, XML, console, and HTTP APIs ·

* available integration with automated software configuration management systems, including Perforce and CVS (through the Bugzilla email interface and checkin/checkout scripts)