Phil Evans is the programmer behind Scala which is used for scaling and merging. The presentation and slides were given at the Daresbury Laboratory, UK in 2001. This presentation gives a behind the scenes look at the various inputs and outputs of Scala. I would classify this as a though introduction to scaling and merging.

The presentation runs 52 minutes in length. Another aspect which is refreshing is that Phil simply states what he knows and does not. I for one have been to too many presentations that sidestep perplexing issues and questions.

Questions addressed:
Why are intensities on different scales?
What is the real resolution of your diffraction?
Why you should collect differently for phasing and scaling?

Notes of interest:
Turn B-factor on during Scala if you believe there is a large amount of radiation damage
Rmerge and multiplicity are inversely related
-the two references mentioned relating to this point are Weiss and Diederiches

My only compliant would be that the questions are difficult to hear at times.