Some people with developmental disabilities (particularly Autism) exhibit challenging behavior, defined as "culturally abnormal behaviour(s) of such intensity, frequency or duration that the physical safety of the person or others is placed in serious jeopardy, or behaviour which is likely to seriously limit or deny access to the use of ordinary community facilities". Common types of challenging behavior include self-injurious behavior (such as hitting, headbutting, biting), aggressive behavior (such as hitting others, shouting, screaming, spitting, kicking, swearing, hairpulling), inappropriate sexualized behavior (such as public masturbation or groping), behavior directed at property (such as throwing objects and stealing) and stereotyped behaviors (such as repetitive rocking, echolalia or elective incontinence). Such behaviors can be assessed to suggest areas of further improvement, using assessment tools such as the Nisonger Child Behavior Rating Form (NCBRF).