FORTY-THREE STATES HAVE FORMAL INMATE GRIEVANCE MECHANISMS FOR ADULTS AND 23 FOR YOUTH INSTITUTIONS. THESE GRIEVANCE MECHANISMS ARE AVAILABLE TO 255,675 OF 298,632 ADULT AND YOUTH INMATES IN STATE INSTITUTIONS. TWELVE OF THE CORRECTIONAL AGENCIES SERVING THE 20 LARGEST CITIES HAD FORMAL GRIEVANCE MECHANISMS FOR ADULTS. FOUR OF THE 20 LARGEST CITIES EITHER USED STATE INSTITUTIONS FOR SENTENCED YOUTHS OR DID NOT PROVIDE INFORMATION ON YOUTH GRIEVANCE MECHANISMS. ELEVEN OUT OF THE REMAINING 16 HAD FORMAL GRIEVANCE MECHANISMS FOR YOUTH. AN APPENDIX DESCRIBES THE TYPES OF GRIEVANCE MECHANISMS AND THE DESIGN PRINCIPLES FOR GRIEVANCE MECHANISMS.