The purpose of this study is to bear out the claim that the spread of ubiquitous society is improving our behaviors in architectural and urban space. Specifically, the current situation of working mobility over time and space is investigated through the log analysis of e-mail access by discretionary labor. For 81 workers of a certain organization, the each number of real and cyber workplaces is tallied from the 3,241,805 records of e-mail access log files from Sep 1, 2007 to Feb 29, 2008. The percentages of local and remote works are evaluated from the recorded IP addresses and protocol types (POP and IMAP). The percentages of working hour, overtime, and holiday works are also evaluated from time stamps of these records. Then, cluster analysis is performed on the 4 variables; number of workplaces, percentage of remote works, percentage of extra works, summation time of working. As the result, the workers of discretionary labor are categorized into the following 4 working styles; conservative type, temporally-modulated type, spatially-distributed type, and post sedentary type.
