Method

Web as Lab

• Server: Apache 2.0 under Linux
• Client: any graphical browser (no scripting, applets, animation, or frames)
• User interface: XHTML with forms
• Programming: CGI with Perl 5.8
• Subject identity management: random UID, supplied to and by each form
• Subject confidentiality: anonymity
• Subject consent: Agreement terms (right to quit etc.) disclosed
• Session management: form state value compared with session-state file
• Disruption recovery: resumption from start page with UID
• Data capture: text files, 1 file per subject, named with subject's UID
• Raw data format: Key=Value (converted <CRLF> and "%" to %hex)
• Temporary data conversion: pasted raw data into Excel
• Durable data conversion: raw data converted by Perl routine into text matrices, those imported into PostgreSQL