Behavior that challenges	behavior that provides challenges to carers, professional staff, management.
Carer	someone who takes care of a person who needs regular assistance because of an illness, disability or the inability to do some everyday tasks on their own. Care may be provided on a formal (paid) or an informal (unpaid) basis. Care may be regulated or unregulated.
Specialist	a person who concentrates primarily on a particular subject or activity; a person highly skilled (through education, experience or interest) in a specific and restricted field.