May I know if researchers should use multiple methods to assess the reliability of a scale used to measure relapse behaviour of a drug user, and why?

Cheers and don’t mention it.

I appreciate the detailed response.

Yes, researchers should use multiple methods to assess the reliability of a scale used to measure relapse behaviour of a drug user to ensure that the measurement tool is accurate and consistent. Using multiple methods can also help identify sources of measurement error and improve the quality of the data.