The RICHE Reference Architecture defines an open frame work for health
care information systems. Developed within the ESPRIT II programme, i
t is now the basis of several implementations in hospitals in Italy, P
ortugal, Ireland, France and the UK, and of follow-up initiatives such
as EDITH (ESPRIT, no. 7508), NUCLEUS (AIM II, no. 2025) and REFERENCE
(a French hospitals' project). This contribution describes the RICHE
Reference Architecture in detail. Special concern is centred on the mo
dulus that constitute the basic platform of RICHE, and on the methodol
ogy applied to design the interactions between them.