Final answer:
Sequencing is the learning factor that is based on teaching in steps, moving from known to unknown and simple to complex.
Step-by-step explanation:
The learning factor that is based on teaching in steps, specifically known as teaching from known to unknown and simple to complex, is sequencing. Sequencing refers to the process of structuring learning material and activities in a logical order that facilitates understanding and mastery. By sequentially presenting concepts or skills in a progressive manner, learners are able to build on their prior knowledge and gradually tackle more complex tasks.