Second variant — a part-whole sequence.
As in the previous case, you need to choose the context complexity (easy, medium, and difficult) and the subgroup of skills (minimal, partial, and complete use of the skill hierarchy). The difference with the previous variant is that your high-level condition is the subgroup of skills.
In other words, within each high-level condition (minimal, partial, and complete use of the skill hierarchy), students go through a series of problem simulations with easy, medium, and difficult contexts. In this case, the complete amount of skills are trained only at the end of the program, but still, students have the opportunity to train the whole problem and the complete skill hierarchy in an easy, medium, and difficult context.