INTRODUCTION ...................................................................................................................... 4 OBJECTIVE OF THIS DOCUMENT ................................................................................................. 4 PURPOSES OF USING MEDDRA ................................................................................................. 5 BACKGROUND ........................................................................................................................... 5 SCOPE OF THE POINTS TO CONSIDER ......................................................................................... 6 GENERAL PRINCIPLES ......................................................................................................... 6 QUALITY OF SOURCE DATA ....................................................................................................... 6 LEVEL OF TERM SELECTION ....................................................................................................... 6 USE OF