+ The sample of 266 was high so findinfs should be generalisable to heavily dependant poly-drug uses in Switzerland.
- However findings are culture bind to Switzerland as it may not be generalisable to those from other cultures as they may be ethnocentric.
+ Independent researches condicted the interviews and alaylised the findings to ensure no researcher bias, therefore subjectiviy should be minimal.
+ The interviews were structured and used the same fixed questions so another researcher could repete the investigation.
+ It shows how appropriate programms…