Validating an existing non-validated checklist

I have a question for everyone.

Is it possible to validate an existing published checklist that has not yet been validated with the authors' permission? If so, what steps would you recommend to use go about for testing validity and reliability? We do not want to create a whole new checklist on our own.


Less is more. Stay pure. Stay poor.
Well you need to know the true outcome of interest in order to validate something. If it is say a screening for colon cancer, you then need to know the true colon cancer status - so a good-standard method or process needs to exist.

For reliability, you just need a target sample to examine then you can test inter- and intra-reliability.