Extension and Application Tefko Saracevic School of Communication, Information and Library Studies, Rutgers University Abstract User-system interaction is a critical aspect for IR and digital libraries as well. Thus, a better understanding and modeling of these processes is of great importance to efforts aimed at making these systems more user responsive. Thus, several IR interaction models have been proposed. On the computer there are at least engineering, processing, and content levels.
Interaction is the interplay between various levels.
Examples from a large study of interaction are used to illustrate these extensions. Suggestions for further research are made.