Architecting mobile collaborative applications has always been a challenge for
designers. However, counting on a structural design as a reference can help
developers to reduce risks and efforts involved in system design. This article
presents a reusable architecture which helps modeling the communication and
coordination services required by mobile collaborative applications to support
collaboration among users. This architecture has been used as a basis for the
design of several mobile systems. Two of them are presented in this article to
show the applicability of the proposal to real world collaborative systems.