Theoretical evolution tracks in the HR diagram for the ensemble of calculated models for all metallicities (Z_⊙, Z = 0.004, Z = 0.002, and Z = 0.0001, from top to bottom). In the left panels, the tracks are shown for the rotating models from the pre-main sequence on. In the right panels, both standard and rotating predictions are shown (dashed and solid lines respectively) from the ZAMS and beyond.