Participants solved a series of math operations while trying
to remember a set of unrelated letters. At recall, letters from the
current set were recalled in the correct order by clicking on the
appropriate letters (Unsworth, Heitz, Schrock, & Engle, 2005). For
all of the WMC measures, items were scored if the item was correct
and in the correct position. The score was the number of correct
items in the correct position.