1) methods - different ways to achieve different outcomes under different conditions 2) conditions - factors that influence the effects of methods and are therefore important for prescribing methods 3) outcomes - the various effects that provide a measure of the value of alternative methods under different conditions (actual or desired) (kinds: efficiency, effectiveness and appeal of instruction) "Something that is a method variable in one school (because the teacher can change it) may be a condition variable in another school (because the teacher cannot change it)." Reigeluth, 1983, p. 14-15
A conceptual framework of learning on which domain-specific, individualized, theories of learning can be constructed.