Yes, screencasts are good, and IMHO people who struggle with instructions seem much better at re-watching the difficult part until they are able to do it than t

Yes, screencasts are good, and IMHO people who struggle with instructions seem much better at re-watching the difficult part until they are able to do it than they are keen to re-read a section until they get it right. However it is often essential to have an alternative form (eg transcription or at least summary of steps) simply because of discoverability - even with brief screencasts it can be awkward finding the content otherwise. I see a lot of responses here automatically assuming that capturing institutional knowledge is about code, but there's so much more of business processes than code that needs to be captured, even in a tech rich environment.