http://www.census.gov/ipc/www/cspro/download/start40.pdf
http://www.census.gov/ipc/www/cspro/download/cspro40.pdf
http://www.census.gov/ipc/www/cspro/download/csent40.pdf
The Census and Survey Processing System (CSPro) is a software package for entering, editing, tabulating, and disseminating data from censuses and surveys. CSPro combines the features of the Integrated Microcomputer Processing System (IMPS) and the Integrated System for Survey Analysis (ISSA).