The number ( % ) of practices that implemented 1 or more key activities in each CCM component varied : Patient Self-Management Support : 37 ( 100 % ) ; Clinical Information Systems : 24 ( 64.9 % ) , Delivery System Design : 14 ( 37.8 % ) , Decision Support : 13 ( 35.1 % ) , Community Linkages : 2 ( 5.4 % ) ; Healthcare System Support : 2 ( 2.7 % ) .