In the 1930's Mr Vygotsky studied how young children learn language. He suggested that they acquire new knowledge by working with slightly more experienced practitioners. By doing so the novice is stretched, while the more experienced has to clarify their own understanding in order to explain it. If the stretch is too great or too small the novice will give up through fear of failure of boredom. If the challenge is in a zone between these two levels the novice will keep working away until they progress. When an instructor deliberately constructs a series of progressively more challenging steps for a learner to move them from one state of performance to another they are said to be Scaffolding learning.
This information was hidden behind a language barrier, Russian / English, and the cold war until it was first translated into English in the 1970's. Long after Zygotsky's premature death.
The application of this methodology in the 7SC is clear. Each skill having 7 levels where the learner is expected to develop a little more accuracy, two footedness, power or to begin combining skills is scaffolding. Often I will further scaffold between levels, e.g. heading over 3m, 4m and 5m.