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Аннотация If a stress sigma is applied to a polycrystal of grain size L, the mode of creep deformation depends on the answers to the following questions: (I) does sigma exceed the Peierls stress sigmap; (II) does L exceed the dislocation spacing in a Taylor lattice stabilized by sigmap; (III) does Lsigma exceed the value required for a Frank--Read or Bardeen--Herring source to operate within the grain; (IV) does L1/2sigma exceed the Hall--Petch value required for slip to propagate across a grain boundary? The (L,sigma) plane is thus partitioned into regions in which different modes of creep predominate.