Technology Tradeoffs : Terms

• Server is machine/software the study resides
• Client is the machine/software in use by the participant
• Client-Pull:
  • information is drawn from server at request of client browser
  • More polite
• Server-Push:
  • information is driven by the server
  • What is presented is now no longer under the control of the participant
• IP address
  • Machine Address on the network
  • IVp4: xxx.xxx.xxx.xxx
  • IVp6 –coming down the pike
  • In many cases dynamically assigned
  • For an server, try to get fixed IP address
• Domain Name
  • We don't like numbers Names to make machine location more memorable
  • Tiny URL
• Protocols and URL's
  • A protocol is the means of communicating
  • Sort of like a language
    • E.g. hypertext transfer protocol (http) vs.
    • file transfer protocol (ftp) vs.
    • hypertext transfer protocol secured (https)
  • Uniform Resource Located
    • Common format for getting formation:
    • Protocol://server.domain/(path/filename)
    • http://psych.hanover.edu/
• Internet Connectivity
  • People connect in different ways
    • Modem
    • Cable modem
    • Wireless
    • LAN
  • These difference impact time to download and, thus, willingness to continue
• Technical Variance
  • Data variation resulting from the use of technology
• Denial of Participation:
  • Prevention or reduced likelihood of participation based upon the technical requirements of study e.g., visually impaired

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