FLUD Visualization Tool | Download | Installation | Operation | Results


When designing or evaluating a website, a usability engineer (UE) may wish to conduct tests in which subjects are asked to perform some tasks. The UE then needs to capture and analyze the results of such tests. As discussed elsewhere, the WebVIP tool may be used to capture various aspects of subjects' behavior. FLUDViz presents the UE with an abstract visualization (see example) of the actions taken by a subject during a single test session.

This visualization helps the UE to answer such questions as:

  • How long did the subject take to complete the tasks of the session?
  • Which pages were visited during the session?
  • How many windows did the subject have open?
  • What intra-page activity took place (e.g. form-filling, mouse-clicks)?


FLUDViz presents a 2D visualization of the activity of a single subject during a test session. The x-axis is used for time, and the y-axis for the types of behavior. The UE can zoom and pan in the time dimension by manipulating a time slider at the bottom of the display.

The UE can also filter activity type in the Y dimension through the control menu. For instance, the UE may wish to see only the subject's keyboard activity, and suppress the rest.

For full details of an action, the UE can click on the various icons of the visualization. This causes the pretty-printed version of the FLUD file to be displayed in the UE's browser, with the selected element positioned for immediate viewing.


FLUDViz is a tool in the Web Metrics Testbed developed at NIST. For more information, see http://www.nist.gov/webmetrics. Direct all comments and questions to webmetrics@nist.gov. Before using this tool, please review the FLUDViz release notes and known bugs.

See NIST Web Metrics disclaimer.

Overview | Installation | Operation | Results | FAQ
Version 1.0
Page last modified: 15 May 2002
National Institute of Standards and Technology (NIST)