With this tool you can list the users assigned to some role(s) depending on various criteria:

• role (or any role)
• user fullname or idnumber (full or begin of)
• institution (full or part of)
• department (full or part of)
• course category having courses in which they are involved (or related child subcategories)
• course(s) in which they are involved (part of one single shortname or full shortnames)
• city (full or part of)
  It only works at three context levels: system, coursecategory, course.

See http://moodle.org/mod/data/view.php?d=13&rid=796