There is a wide perception of the need for conformance and interoperab
ility testing to ensure the interoperability of open systems. In the c
ircumstances, we have been making efforts to establish a system for in
terconnectability testing, which is a type of the interoperability tes
ting. In this paper, we discuss an interconnectability testing system,
named AICTS (AIC's InterConnectability Testing System) that we have d
esigned. We also discuss a conformance testing system, named ACTS (AIC
Conformance Test System), which we developed as the first step toward
building an interconnectability testing system. ACTS is capable of ex
tensions for an interconnectability testing system.