Therapeutic Drug Monitoring aims to individualise therapeutic regimen. Computer technology has facilitated this process radically. Whereas in the 60th and 70th years of the last century linear regression of the logs of peaks and trough levels was useful at that time, nowadays Bayesian techniques have improved the process of analysing plasma samples and calculation of drug doses. But there are very few computer programmes available, and sometimes they are not really user-friendly. In this workshop the participant can bring his/her own laptop and during the workshop the computer programme MW/PHARM will be demonstrated and will be used by each participant to work with it. So bring your own laptop. 10 computers will also be available for use or sharing. Laptops should be running Windows XP/Microsoft Office 2003 or earlier.