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(Also posted on the MSDN forum - but that doesn't get much traffic, as far as I can see.) I've been trying to provide an example of Assert and Assume . Here's the code I've got: public static int RollDice(Random rng) { Contract.Ensures(Contract.Result<int>() >= 2 && Contract.Result<int>() <= 12); if (rng == null) { rng = new Random(); } Contract.Assert(rng != null); int firstRoll = rng.Next(1, 7); Contract.Assume(firstRoll >= 1 && firstRoll <= 6); int secondRoll = rng.Next(1, 7); Contract.Assume(secondRoll >= 1 && secondRoll <= 6); return firstRoll + secondRoll; } (The business about being able to pass in a null reference instead of an existing Random reference is purely pedagogical, of course.) I had hoped that if the checker knew that firstRoll and secondRoll were each in the range [1, 6] , it would be able to work out that the sum was in the range [2, 12] . Is this an unreasonable hope? I realise it's a tricky business, working out exactly what might happen... but I was hoping the checker would be smart enough :) If this isn't supported now, does anyone here know if it's likely to be supported in the near-ish future? EDIT: I've now found that there are very complicated options for arithmetic in the static checker. Using the "advanced" text box I can try them out from Visual Studio, but there's no decent explanation of what they do, as far as I can tell.

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