Interactive video: 

Interactive video is a design concept for user controlled
information access within a linear or nonlinear system structure.
The concept is particularly appropriate for nonlinear and random
access applications.  The objective of interactive video is to
tailor the speed and order of information presentation to suit
the individual user.  The user assumes an active role in the
information retrieval process, defining the desired path through
the information base.  This technique has been used primarily for
predefined (programmed) instructional and information
dissemination applications.  As a learning environment, the
computer and videodisc system is infinitely patient, allowing the
programming of limitless remediation loops and user controlled
drill and practice routines.  The videodisc medium provides an 
opportunity to integrate text, sound, still graphic image frames,
and real time motion segments to simulate a meaningful learning
environment.  A wide range of user interface alternatives are
possible, including keyboard, audio, video, pointing devices, and
touch sensitive screens.  Systems are relatively transportable,
meaning that a user can engage the "portable classroom" at an
appropriate training site outside of traditional educational
constraints.  Interactive video is a particularly effective
instructional strategy where visual demonstration of technique
and/or subtlety is required, and where on the job training
entails excessive costs, special expertise, equipment down time,
or high risk activities.  Preservation applications might include
instructional programs containing simulations of preservation
activities requiring sensitive handwork, special craft techniques
or tool use, and diagnostic interpretation from sensory or other
evidence.

<cfile42>   Video Systems
<cfile54>   Hypertext vs. Interactive Video
<cfile55>   Effectiveness of Interactive Video