As libraries and information services address the needs of users in an incr
easingly networked environment, there is a need for theoretical models to u
nderpin research, development and practice. The characteristics and roles o
f traditional libraries and information services are described, and a varie
ty of predictions about their future are examined. A number of recent model
s of the 'electronic' or 'digital' library are analysed, and the concept of
the 'hybrid' library is described. On this basis a generic model of the li
brary, using that term in its broadest sense, is developed. A number of app
lication areas are identified.