CHI’97 Workshop on Object Models in User Interface Design organized by Mark van Harmelen, and reported as:
van Harmelen, M., Artim, J., Butler, K., Henderson, A., Roberts, D., Rosson, M. B., Tarby, J. C., Wilson, S., Object Models in User Interface Design: A CHI97 Workshop, ACM SIGCHI Bulletin, October 1997.
HTML version, and the UML-expressed meta-model formulated after the workshop.

CHI’98 Workshop on Incorporating Work, Process and Task Analysis Into Commercial and Industrial Object-Oriented System Development
Artim, J., van Harmelen, M., Butler, K., Gulliksen, J., Henderson, H., Kovacevic, S., Shijian, L., Overmyer, S., Reaux, R., Roberts, D., Tarby, J.C., Linden, K. V., Incorporating Work, Process and Task Analysis Into Commercial and Industrial Object-Oriented System Development, ACM SIGCHI Bulletin.

ECOOP’99 Workshop on Interactive System Design and Object Models
Nunes, N., Toranzo, M., Cunha, J., Castro, J., Kovacevic, S., Roberts, D., Tarby, J., Collins-Cope, M., van Harmelen, M., Workshop on Interactive System Design and Object Models, in Moreia, A., (Editors), ECOOP’99 Workshop Reader, Springer-Verlag LNCS, 1999.

ECOOP’99 Workshop on Integrating Human-Factor into Use-cases and OO methods
Seffah, A., Hayne, C., Workshop on Integrating Human Factors into Use-cases and Object-Oriented Methods, in Moreia, A., (Editors), ECOOP’99 Workshop Reader, Springer-Verlag LNCS, 1999.

British HCI Group and ScotlandIS One-Day Symposium: Usability and UML 18 January 2002, Edinburgh, UK.