The Phenomenology is the picture of the Hegelian philosophy in the making - at the stage before the scaffolding has been removed from the building.
The Phenomenology of Spirit, regarded as an introduction, suffers from a different fault.
The Phenomenology is neither mere psychology, nor logic, nor moral philosophy, nor history, but is all of these and a great deal more.
It will pass the test of what you can call differential phenomenology.
But in the progress of his physical work, which taught him, as he thought, to distinguish between what we see and what we mentally supply, he soon passed from this noumenalism to a " universal physical phenomenology."