Which term refers to a person who aids a learner in achieving more than they could alone?

The term that accurately describes a person who assists a learner in reaching higher levels of understanding or skill than they could achieve independently is "more knowledgeable other" (MKO). This concept comes from the social constructivist theory, particularly associated with Vygotsky, who emphasized the importance of social interaction in learning. An MKO may be a teacher, a peer, a parent, or anyone who has a better understanding of the subject matter than the learner. The key aspect of an MKO is their ability to provide support, guidance, and scaffolding to enhance the learner's capabilities, facilitating their progression through the zone of proximal development.

The other options, while related to educational support, do not capture the specific context of assisting a learner in a way that emphasizes the dynamic relationship of guidance and support that is integral to the MKO concept. Knowledge facilitators and guiding instructors may play roles in education, but they do not inherently imply the same depth of understanding or support as an MKO. An expert mentor may offer significant help, but the term more specifically reflects the interactive educational process highlighted by Vygotsky.