Operation Span Task (OSPAN)
Alternate Names: Automated Operation Span Task
FREE for use with an Inquisit Lab or Inquisit Web license.Available Test Forms
Automated Operation Span - English
The Automated Operation Span (OSPAN) Task. Thanks to David Nitz for programming this script, and Jerry Grenard for programming an earlier version.
References

Turner, M. L., & Engle, R. W. (1989). Is working memory capacity task dependent? Journal of Memory & Language, 28, 127-154.
Kane, M. J., Bleckley, M. K., Conway, A. R. A., & Engle, R. W. (2001). A controlled-attention view of working-memory capacity. Journal of Experimental Psychology: General, 130, 169-183.
Kane, M. J., & Engle, R. W. (2003). Working-memory capacity and the control of attention: The contributions of goal neglect, response competition, and task set to Stroop interference. Journal of Experimental Psychology: General, 132, 47-70.
Unsworth, N., Heitz, R.P., Schrock, J.C., & Engle, R.W. (2005). An automated version of the operation span task. Behavior Research Methods, 37, 498 - 505.
Links
Randy Engle. Georgia Tech.