Three data collection methods (street-intercept, telephone ring-in and focus-group discussion) were compared for their feasibility, reliability, validity and cost.

The subjects of investigation were drug-related behaviours, attitudes and knowledge among current illicit drug users aged 16 to 21 years in Sydney. All three methods were found to be feasible and to produce reliable and valid information.

https://onlinelibrary.wiley.com/doi/epdf/10.1111/j.1753-6405.1993.tb00135.x

Photo credit: NOFFS