This directory contains files for Technical Report CSRI-364. The files in this directory are the following: 1) README (< 1 KB - the ASCII file you are now reading) 2) TR-364.ps (390 KB - PostScript) 3) TR-364.ps.gz ( 47 KB - PostScript compressed with the program "gzip") If you have the UNIX "gunzip" program, get the file TR-364.ps.gz. Remember to transfer the file in binary mode. After the transfer, "gunzip" the file. If you do not have the UNIX "gunzip" program, get the file TR-364.ps in ASCII mode. After transfering the file, print it on a PostScript printer. If you have any questions or comments about this technical report, please contact modjeska@cs.toronto.edu ABSTRACT: The growing World-Wide Web requires scientific research to strengthen and extend design guidelines. Exploratory research was undertaken to investigate the relationship between (1) site size and structure and (2) user navigation and perception. Experimental results showed that strongly hierarchical sites are more usable; site size has little effect on user navigation and mental models; nodes high in the hierarchy tend to be more memorable; and strongly hierarchical sites are perceived as smaller than weakly hierarchical sites, other factors being equal. Results also showed that structural landmarks tend to be poor predictors of behavioral landmarks.