The Substance Misuse Data Set (SMDS) (also known as Welsh National Database for Substance Misuse - WNDSM) captures information relating to a client journey in a substance misuse agency. This journey is made up of a number of ‘events’ – one referral, one assessment, one (or more) Treatment Modalities, multiple Treatment Outcomes Profile (TOPs) and one discharge. Welsh providers delivering substance misuse treatment and who are in receipt of Welsh Government substance misuse revenue funding are required to submit the Dataset. Treatment Outcomes Profiles are only required to be completed for Adults (age 16 and over) in receipt of structured treatments.