Effective with the launch of the Next Generation NCLEX (NGN) on April 1, 2023, Multiple Response (MR) and Select All That Apply (SATA) items are scored using the polytomous model. This allows partial scores of items with multiple points to evaluate partial understanding. For context, pre-NGN launch NCLEX items were scored using the dichotomous models, which allowed only for scores as either 'all correct' or 'all incorrect'. Samples of NCLEX items can be found in the published Sample Pack.
For more information about NCLEX items, we suggest reviewing all the resources available on NCLEX.com including NGN News and NGN Videos. The document NGN News - Summer 2021 has the most detailed descriptions of multiple response items and partial scoring that NCSBN provides.