This is an original callsheet from the filming of the movie "Harry Potter And The Half-Blood Prince" at Leavesden Studios in England on 8th May 2008.

It details who is required on set that day (which includes Helena Bonham Carter), and what they will be filming, or in the case of those not actually filming that day, what they will be required for (costume fitting etc).

Callsheets, like this one, provide a fascinating insight into the glamorous (or not-so-glamorous) world of movie-making, and give us a clue as to the level of planning required to successfully make a box-office hit like the "Harry Potter" movies.