For the last six months I've been posting a series on 'World Championship Opening Preparation'. The posts have been primarily excerpts from participants in the matches and covered events held since FIDE took responsibility for the World Championship in 1948.
The following table lists the posts and shows which matches were covered by which posts. The column headers are a bit cryptic, but should make sense once you know that '5x' means matches played in the 1950s.
Modern opening preparation gathered steam during the five Kasparov - Karpov matches, which explains why each of those matches is listed individually; there is simply more source material. Curiously, the 1987 match (KK4) is missing an entry, meaning that I should make a special effort to include it.
I intend to come back to this topic in the future, but I'll give it a rest for now. There are other topics that deserve attention.