Implications of the EMC experiment and several other experiments for the strangeness content of the proton are presented. The gluon contribution to the proton spin is shown to be arbitrary due to factorisation ambiguities, so adding a gluon contribution cannot explain why &Dgr;smight be large. The polarized gluon distribution &Dgr;gis shown to be given by a gauge invariant but non‐local operator. Other topics discussed include the gauge variation of the forward matrix element ofK&mgr;, whether &Dgr;gcan be measured by studying large transverse momentum jets, the angular momentum sum rule, and the implications of the renormalisation group invariance of &Dgr;&Sgr;+(&agr;s/2&pgr;) &Dgr;gfor quark models. &Dgr;sin the proton is analysed using the chiral quark model, and in the largeNclimit.