Operation Valkyrie is a chronological history of the development of the Valkyrie Plot with the names of the conspirators and reasons why they felt it was necessary. The film is best used by serious history students seeking information about the details of the plot, but I don't feel it would be good to use in a classroom (especially at the high school level or lower grades).
The material presented is informative and there i a separate interview with Nigel Jones, author of "Countdown to Valkyrie", which deals with hie reasons for writing about Claus von STauffenberg. He also discusses his own interview with Berthold von Stauffenberg, the son of Claus von STauffenberg.