The purpose of this paper is to describe what harm reduction is, how i
t developed, how it works, and why it is becoming a major approach in
the addictive behaviors field. Based on principles of public health, h
arm reduction offers a pragmatic yet compassionate set of strategies d
esigned to reduce the harmful consequences of addictive behavior for b
oth drug consumers and the communities in which they live. To illustra
te how harm reduction has been applied to both the prevention and trea
tment of addiction problems, highlights of a national conference on ha
rm reduction are presented. The historical roots of harm reduction pro
grams in Europe (Netherlands and the United Kingdom) are described. Th
e paper concludes with a discussion of four basic assumptions central
to harm reduction: (a) harm reduction is a public health alternative t
o the moral/criminal and disease models of drug use and addiction; (b)
it recognizes abstinence as an ideal outcome but accepts alternatives
that reduce harm; (c) it has emerged primarily as a ''bottom-up'' app
roach based on addict advocacy, rather than a ''top-down'' policy esta
blished by addiction professionals; and (d) it promotes low threshold
access to services as an alternative to traditional high threshold app
roaches.