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The impact of the recent very precise CLAS and COMPASS g1/F1 data onpolarized parton densities and higher twist effects is discussed. It isdemonstrated that the low Q^2 CLAS data improve essentially our knowledge ofhigher twist corrections to the spin structure function g1, while the large Q^2COMPASS data influence mainly the strange quark and gluon polarizations. It isalso shown that the uncertainties in the determination of the polarized partondensities are significantly reduced. We find also that the present inclusiveDIS data cannot rule out a negative polarized and changing in sign gluondensities. The present status of the proton spin sum rule is discussed.

Progress in the Determination of Polarized PDFs and Higher Twist