[support] Assigning task to employee

*How to include username in the taxonomy for taging* Hi Am working in task manager product , Scope of the project is assign task to user's , For example , one online booking site , 5 developers are involed , and 2 tester , Tester find the bug in the site and assign to appropriate developer , All are have separate login for the task management , , Assume tester A find the issue and that issue is assign to developer x, How to Include the username in taxonomy list , is there any module there ... Becoz if we list the username in the list box , then tester can select the employee name from the list box and then send the task to approriate developer , Any idea , Thanks Thanks