Poly(OxyMethylene) (POM) and its miscible blends were studied by multifrequency A.C. dielectric and thermally stimulated currents (TSC). The blends contained small amounts of either poly(vinyl phenol), which is a high glass transition (T-g) diluent, or a styrene-co-hydroxy styrene oligomeric low T-g diluent. The variation of the 10 degrees C "beta" transition with blend composition proves that it is the glass transition, and that the -70 degrees C "gamma" transition is a local motion. Dielectrically the beta transition is very weak in pure POM even in fast-quenched samples. The TSC thermal sampling method also detected two cooperative transitions, gamma and beta, in POM and its blends, and was used to directly resolve the gamma transition into low and high activation energy components. If one considers the contribution of exclusion of the diluents from the crystal lamellae, it is shown that the blends behave like typical amorphous blends as a function of concentration. The effect of crystals on amorphous motions is examined in light of comparison with van Krevelen’s(37) predictions of an "amorphous" T-g, and the transitions in POM are contrasted with those for other semicrystalline polymers.