In Europe, demand has increased in recent years for the treatment of problematic consumption of psychoactive substances (illegal or not). Despite a diversified outpatient care offer, general practitioners (GPs) are seen as major players in detecting and managing problems related to substance abuse. Similarly, occupational physicians (OPs) are also expected to play a role in the field of substance abuse, as health and safety promoters in the workplace (collective bargaining convention Nr. 100). There is a clear lack of scientific data concerning addiction management by these two actors. Little is known about resources and strategies used by these health professionals when they are faced with this issue, nor what their interest or attitude are in it. The proposal of the UP TO DATE consortium aimed to provide an accurate view of the management of addiction in Belgium, from the physicians' perspective. Other professionals from the addiction sector will also be interviewed to assess if they consider these physicians as a support, and if the role played by GPs is sufficiently valued. This federal study will address this issue in both the French and Dutch-speaking regions. The purpose of this research was to know 1) what the current demand is for care in the front line; 2) to what extent GPs and OPs are involved in this problem, and 3) what resources they are able to use to provide appropriate response to all types of requests for treatment of substance abuse.