How do researchers define self-injurious behavior?

Goodwin et al. (2012) read every paper they could find on self-injury in people with intellectual disability. They sorted the definitions like you might sort Lego bricks by shape. The goal was to see how researchers talk about the same behavior in different ways.

Some papers call any self-harm 'self-injury.' Others reserve the term for the repetitive head-hits, bites, or scratches common in ID. The review says: pick the ID-specific meaning or your data will mix apples with oranges.

Iwata et al. (1990) built the SIT Scale to count tissue damage. Goodwin et al. (2012) later showed that tool only makes sense if you first define the behavior as repetitive SIB in ID, not general self-mutilation.

Weeden et al. (2010) found most FA papers forget to report safety rules. Goodwin et al. (2012) agree: clear definitions must include how to keep clients safe during assessment.

Pickard et al. (2022) later proved adults with ID can self-report pain when questions are simplified. This extends L et al.'s call for ID-adapted tools beyond observer codes.

Before you write a behavior plan, state your definition. If the behavior is repetitive SIB tied to ID, say so. Use the SIT Scale to log damage, but pair it with session-stop rules like Marc et al. suggest. Clear labels keep teams consistent and keep clients safe.