BIBCYT http://bibcyt.ucla.edu.ve/cgi-win/be_alex.exe?Ultimo&Nombrebd=BIBCYT UCLA - Biblioteca de Ciencias y Tecnologia Felix Morales Bueno Erickson, Thomas mrl@us.ibm.com P Principal Halverson, Christine krys@us.ibm.com P Principal Kellogg, Wendy A. wkellogg@us.ibm.com P Principal Laff, Mark mrl@us.ibm.com P Principal Wolf, Tracee tlwolf@us.ibm.com P Principal Social translucence: designing social infrastructures that make collective activity visible 45 pp.40-44.; 28cm.; il.