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Last updated 18 January 2012, created 19 September 2011, viewed 1,518
An investigation for KS3 students linked to the Enigma Code-breaking machine. It has clear teachers' notes, and a level-ladder used for self- and peer-assessment as well as teacher levelling.
The investigation centres on the combinations of rotors used in an Enigma machine, and encourages the use of systematic working to record results.