Hi everyone! Following my previous post, I also found the Opiate Treatment Index (OTI) is recommended by others. Would you please kindly give me more information about using it in a program evaluation?

My pleasure.

Thanks a lot!

The Opiate Treatment Index (OTI) is a comprehensive evaluative tool. It is multi-dimensional in structure, with scales measuring six independently measured outcome domains: drug use; HIV risk-taking behavior; social functioning; criminality; health; and psychological adjustment. A complete description of the OTI and data concerning its reliability and validity can be found in Darke et al (1992). The OTI has also subsequently been successfully tested for reliability and validity in the United Kingdom (Adelekan et al, 1996a) and New Zealand (Deering & Sellman, 1996). Overall, the psychometric properties of the Index are excellent, suggesting that the OTI is a relatively quick, efficient means of obtaining reliable and valid data on opiate users undergoing treatment over a range of relevant outcome domains. It should be also emphasized that the OTI should not be considered as an alternative to a clinical assessment. Rather, it provides data on key variables over a range of outcome domains. There will always be other variables of interest to clinicians which are not covered in the OTI.

You could find the below for more information:
https://ndarc.med.unsw.edu.au/resource/opiate-treatment-index-oti-manual