while I'm on the subject the airplane flying handbook sums it up relatively cleanly..
Since on a normal approach the power setting is not fixed as in a power-off approach, the power and pitch attitude should be adjusted simultaneously as necessary, to control the airspeed, and the descent angle, or to attain the desired altitudes along the approach path. By lowering the nose and reducing power to keep approach airspeed constant, a descent at a higher rate can be made to correct for being too high in the approach. This is one reason for performing approaches with partial power; if the approach is too high, merely lower the nose and reduce the power. When the approach istoo low, add power and raise the nose
You can interpret that anyway you wish, to me it simply means adjust power for the glide path and adjust pitch to maintain airspeed with power changes simultaneously.