This paper describes ID Expert, an intelligent computer-based multimed
ia interactive instructional development and delivery system. This pap
er illustrates the following features of this system: Instructional de
sign principles can be built into reusable instructional strategy comp
uter algorithms (instructional transaction shells). This feature signi
ficantly reduces the programming task and insures more effective instr
uctional strategies than often results when a strategy must be rebuilt
for every lesson or course. A decoupled knowledge base makes it possi
ble, at the click of a button, to attach or unattach a given knowledge
object to a reusable preprogrammed instructional strategy. This featu
re significantly reduces the instructional development effort. Instruc
tional strategies specified by parameters makes it possible, at the cl
ick of a button, to change an instructional strategy. This feature sig
nificantly reduces the effort required for designing or redesigning a
lesson or course. instructional strategies specified by parameters mak
es it possible to design multiple strategies for a given course or les
son and makes it possible, at the click of a button, to change from on
e strategy to another. When implemented for modification during instru
ction, based on student performance, this feature makes possible adapt
ive instruction.