Okwudiba (2005), Nnoli et al; highlighted the function of instructional materials in the promotion of learning that instructional materials.
I. Provide increased interest in learning
II. Hold the leaner’s attention
III. Provide the leaner with opportunities of interacting with their social and physical environment (excursion)
IV. Offer learners opportunity for independent and individualized learning
V. Supply concepts basis for conceptual thinking
VI. Offer opportunities for leaner to develop their abilities and skills
VII. Promote the acquisition and longer retention of knowledge.
For this point, instructional materials help to promote the understanding of the teaching learning process among other function. Good availability and utilization of instructional materials should be appropriate, free of bias, up tp date, easily obtainable and should not be too expensive. It also leads to more understanding and retentive memory in students in the teaching and learning process.