Instructional systems development has been in existence for a long time. Even though ISD is now recognized and implemented worldwide, there are many facets of the ISD process that are misunderstood or underappreciated. ISD in its purist form is simply a system for the design, implementation, and evaluation of instruction.
ISD is timeless
One of the most valuable assets of ISD is that the process of instructional design doesn't change based on decisions made on any individual design issue.