\begin{thebibliography}{}

\bibitem[\protect\citeauthoryear{Austin}{1962}]{Austin}
J.~A. Austin.
\newblock {\em How to Do Things with Words}.
\newblock Harvard University Press, 1962.

\bibitem[\protect\citeauthoryear{Baker and Lund}{1996}]{Baker96}
M.~Baker and C.~Lund.
\newblock Flexibly structuring interaction in a {CSCL} environment.
\newblock To be presented at European Conference on AI in Education. Lisbon,
  Spetember, 1996.

\bibitem[\protect\citeauthoryear{Barwise}{1989}]{Barwise89a}
Jon Barwise.
\newblock {\em The Situation in Logic}, chapter 9: On the Model Theory of
  Common Knowledge.
\newblock CSLI Lecture Notes: Number 17. Center for The Study of Language and
  Information, 1989.

\bibitem[\protect\citeauthoryear{Chi \bgroup \em et al.\egroup }{1989}]{Chi89}
M.T.H. Chi, M.~Bassok, M.W. Lewis, P.~Reimann, and R.~Glaser.
\newblock Self-explanations: How students study and use examples in learning to
  solve problems.
\newblock {\em Cognitive Science}, 13:145--182, 1989.

\bibitem[\protect\citeauthoryear{Clark and Brennan}{1991}]{ClarkBrennan91}
Herbert~H. Clark and Susan~E. Brennan.
\newblock Grounding in communication.
\newblock In L.~B. Resnick, J.~Levine, and S.~D. Teasley, editors, {\em
  Perspectives on Socially Shared Cognition}. APA, 1991.

\bibitem[\protect\citeauthoryear{Clark and Marshall}{1981}]{Clark81}
Herbert~H. Clark and Catherine~R. Marshall.
\newblock Definite reference and mutual knowledge.
\newblock In Aravind~K. Joshi, Bonnie~L. Webber, and Ivan~A. Sag, editors, {\em
  Elements of Discourse Understanding}. Cambridge University Press, 1981.
\newblock Also appears as Chapter 1 in \cite{Clark92}.

\bibitem[\protect\citeauthoryear{Clark and Schaefer}{1989}]{Clark89}
Herbert~H. Clark and Edward~F. Schaefer.
\newblock Contributing to discourse.
\newblock {\em Cognitive Science}, 13:259--294, 1989.
\newblock Also appears as Chapter 5 in \cite{Clark92}.

\bibitem[\protect\citeauthoryear{Clark and Wilkes-Gibbs}{1986}]{Clark86}
Herbert~H. Clark and Deanna Wilkes-Gibbs.
\newblock Referring as a collaborative process.
\newblock {\em Cognition}, 22:1--39, 1986.
\newblock Also appears as Chapter 4 in \cite{Clark92}.

\bibitem[\protect\citeauthoryear{Clark}{1992}]{Clark92}
Herbert~H. Clark.
\newblock {\em Arenas of Language Use}.
\newblock University of Chicago Press, 1992.

\bibitem[\protect\citeauthoryear{Clark}{1994}]{Clark94}
Herbert~H. Clark.
\newblock Managing problems in speaking.
\newblock {\em Speech Communication}, 15:243 -- 250, 1994.

\bibitem[\protect\citeauthoryear{Curtis}{1993}]{CURTIS93b}
Pavel Curtis.
\newblock {LambdaMOO} programmer's manual.
\newblock Xerox Parc, 1993.

\bibitem[\protect\citeauthoryear{Dillenbourg \bgroup \em et al.\egroup
  }{1995}]{Dillenbourg95}
P.~Dillenbourg, M.~Baker, A.~Blaye, and C.~O'malley.
\newblock The evolution of research on collaborative learning.
\newblock In E.~Spada and P.~Reiman, editors, {\em Learning in Humans and
  Machine: Towards an interdisciplinary learning science}. Elsevier, Oxford,
  1995.

\bibitem[\protect\citeauthoryear{Dillenbourg \bgroup \em et al.\egroup
  }{1996}]{Dillenbourg96}
Pierre Dillenbourg, David Traum, and Daniel Schneider.
\newblock Grounding in multi-modal task-oriented collaboration.
\newblock To be presented at European Conference on AI in Education. Lisbon,
  Spetember, 1996.

\bibitem[\protect\citeauthoryear{Dillenbourg}{To appear}]{Dillenbourg97}
P.~Dillenbourg.
\newblock Some technical implications of the distributed cognition approach on
  the design of interactive learning environments.
\newblock {\em Journal of Artificial Intelligence in Education}, To appear.

\bibitem[\protect\citeauthoryear{Halpern and Moses}{1990}]{Halpern90}
J.~Y. Halpern and Y.~Moses.
\newblock Knowledge and common knowledge in a distributed environment.
\newblock {\em Journal of the ACM}, 37(3):549--587, 1990.

\bibitem[\protect\citeauthoryear{Lewis}{1969}]{Lewis69}
David~K. Lewis.
\newblock {\em Convention: A Philosophical Study}.
\newblock Harvard University Press, 1969.

\bibitem[\protect\citeauthoryear{McRoy and Hirst}{1995}]{McroyHirst95}
Susan~W. McRoy and Graeme Hirst.
\newblock The repair of speech act misunderstandings by abductive inference.
\newblock {\em Computational Linguistics}, 21(4):5--478, 1995.

\bibitem[\protect\citeauthoryear{Roschelle}{1990}]{Roschelle90}
J.~Roschelle.
\newblock Designing for conversations.
\newblock In {\em Working Notes AAAI Spring Symposium on Knowledge-Based
  Environments for Learning and Teaching.}, March 1990.

\bibitem[\protect\citeauthoryear{Traum}{1994}]{Traum94d}
David~R. Traum.
\newblock {\em A Computational Theory of Grounding in Natural Language
  Conversation}.
\newblock PhD thesis, Department of Computer Science, University of Rochester,
  1994.
\newblock Also available as TR 545, Department of Computer Science, University
  of Rochester.

\end{thebibliography}
