http://w3n-a.blogspot.com/2008/11/slow-flight.html

Slow flight could be thought of, by some, as a speed that is less than
cruise. In pilot training and testing, however, slow flight is broken
down into two distinct elements: (1) the establishment, maintenance
of, and maneuvering of the airplane at airspeeds and in configurations
appropriate to takeoffs, climbs, descents, landing approaches and go-
arounds, and, (2) maneuvering at the slowest airspeed at which the
airplane is capable of maintaining controlled flight without
indications of a stall—usually 3 to 5 knots above stalling speed.

http://w3n-a.blogspot.com/2008/11/slow-flight.html