Which instructional approach focuses on building skills progressively by introducing easier skills before harder ones?

The concept of building skills progressively by introducing easier skills before progressing to more challenging ones is best encapsulated by the idea of Sequential Instruction. This approach emphasizes a structured method of teaching where foundational skills are developed first, allowing learners to grasp basic concepts before moving to more complex tasks. By following this sequence, students can construct knowledge incrementally and achieve mastery at each stage, which is critical for effective learning and retention.

Cumulative Instruction is also related, as it requires revisiting and reinforcing previously learned material, but it is more focused on the reinforcement of knowledge rather than solely on the sequence of skill development. Therefore, while all options are relevant to instructional strategies, Sequential Instruction accurately captures the essence of progressive skill building, making it the most suitable choice.