Absrtact. In their paper[14], Bourdeau and Mizoguchi foresaw a framework for ontology-based intelligent
systems. Although it took longer years than their expectation, the ontology they have been developing is now
released for evaluation with the help of the second author. Ontology building is a labor-intensive process and it
is rarely perfect. Our enterprise is not an exception. The current ontology is still very preliminary because it
has been completely reconstructed from the existing one with a few new ideas. So, we hope the readers be
generous when they read the ontology. The ontology presented here is not a light-weight ontology but a heavyweight
ontology. It is built based on philosophical consideration of all the concepts necessary for
understanding learning, instruction and instructional design. Although it is full of axioms, the Hozo GUI which
is based on a frame structure makes it easier to read it. However, the readers are expected to have basic
knowledge of ontology and preferably be aware of the theory of role and of the Hozo way of role
representation. Papers [6][7] would be helpful to grasp what we are doing with this ontology. The prototype
system named SMARTIES is a totally ontology-aware system which fully utilizes the merits of ontology
computationally as well as conceptually. It is so preliminary that it cannot be open to public, though you can
get a rough idea of what it is from the papers.