Explanation : Textbooks prescribed by universities are
meant to be used for teaching all students
of a particular grade; and recommended
articles and journals as well as writings of
great thinkers selected for reflective readings
are meant for all interested learners.
However, programmed instructional and
modular learning material is designed for
step-wise individual learning. It is highly
structured with a sequence of instructional
"frames" of programmed material for
students to work by themselves at their own
speed and answer questions after each step
to evaluate their learning. They are then
immediately shown the correct answer or
given additional information.