Progress, progression are not always clearly distinguished, although they can be more or less sharply differentiated.
Both denote movement forward.
Progress (see also progress n under ADVANCE 2 ) usually applies to a movement considered as a whole, stressing such aspects as the distance covered, the change or changes taking place, and the amount of improvement made.
Progression (see also SUCCESSION ) commonly applies to a movement in itself or in its detail, often implying a continuous series of steps, degrees, or stages toward an objective but sometimes implying little more than a moving on more or less continuously.