Hi Blair, thanks for the response.

I like the idea of using the rand() function and have been playing with it over the weekend. Is it possible to randomly choose a value (either a text label or an image) without replacement? That is, I'd like to make sure values are evenly matched and presented (i.e. 8 of one group via text labels is presented and 8 of the other group as well).

If that's possible via the rand() function I think I would be able to use that and the problem would be solved (re-present the copy of the log file).

If not, I would be interested in automating the process of taking from log files in the original experiment and creating a new input file from that. Could you shed some more light on that procedure? I am unsure how we could achieve this.