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The main challenge in the Standard Model calculation of the mass and widthdifference in $D^0 - \bar D^0$ mixing is to estimate the size of SU(3)breaking. We prove that mixing occurs in the Standard Model only at secondorder in SU(3) violation. We calculate SU(3) breaking due to phase spaceeffects, and find that it can naturally give rise to a width difference$\Delta\Gamma / 2\Gamma \sim 1%$, potentially reducing the sensitivity of Dmixing to new physics.Comment: 9 pages; Talk given at the XXXVIIth Rencontres de Moriond,  Electroweak Interactions and Unified Theories, Les Arcs, March 9-16 2002; and  at the 9th International Symposium on Heavy Flavor Physics, Pasadena,  California, September 10-13 200

D[sup 0]−D̄[sup 0] mixing