Continuous monitoring of computer network performance is probably the
only solution which allows prompt identification of anomalous function
ing conditions and provides knowledge of parameters on which to base r
ecovery interventions. A number of tools for performance management al
ready exist, but their effectiveness is limited as they are essentiall
y inserted inside owner network management solutions. In this paper we
describe the realization of PMt, a platform for the development of pe
rformance management applications for the control and real-time manage
ment of a heterogeneous computer network. PMt uses an object-oriented
approach in managing the various elements in the distributed system, a
nd defines a methodology for the design of applications to monitor per
formance. The methodology is mainly destined for use on distributed sy
stems, and provides the user with a set of tools and services that can
be used to develop management applications.