For tests comprising only dichotomous items, or for tests in which all items share the same rating scale definition, all items belong to one group. For tests in which some items share one rating scale definition, and other items another scale definition, there can be two or more groups.
All items belong to one group.
0's, 1's, 2's, A's, B's, etc. The items can be out of order. If an item is listed twice, the last entry dominates. Responses to all items are on the same 4-point rating scale. An arithmetic test in which partial credit is given for an intermediate level of success on some items.