To minimize sequence effects, you can counterbalance. WEXTOR implements counterbalancing in such a way that the order of blocks for the levels of the within-subjects factor will be randomly chosen for each participant. It does so by creating a set of Web pages for each level of the between factor combinations from which one sequence of within factor blocks will be randomly chosen for each participant.
During data analysis sequences can be identified by the search argument &quot;var=&quot;.
In WEXTOR 2.x, counterbalancing is limited to one within factor with four levels at most. Other types of counterbalancing (more factors and levels, fixed order of sequences, implementation of sequence as between factor) will be added in later versions of WEXTOR.