We introduce our framework called ACACIA for distributed problem solving by 
multiple agents. While most efforts in multi-agent systems (MAS) focus on 
homogenous agents, we acknowledge the need for a higher level framework.  The 
issue on interoperability among various frameworks is addressed.  We design 
a system whereby a group of heterogenous agents can collaborate in solving a 
problem without having to re-engineer the individual agents.  Our framework 
is based mainly on the notion of agencies. We also apply a case-based 
coordination scheme in which a database of collaboration protocols is 
consulted for the given problem situation. 

One of the salient issues in ACACIA is mobility as a component of effective 
planning and messaging since the participating MAS can be continents apart. 
We develop our scheme for mobile coordination. 

ACACIA is a complete agent environment backed by a well-defined framework 
and a robust set of runtime libries.  We also developed our own problem 
solving paradigm in a mobile environment.  Finally, we designed the ACACIA 
network and a runtime environment for the participating ACACIA sites.