CK_a Initial of the child
CK_b Field Worker code 
CK_c Date of Interview (DD/MM/YY)
CK_d Age of Child (in month)
CK_1 When does a child's brain begin to develop and learn ?
CK_2 When do children begin to see?
CK_3 When do children begin to follow a moving person or toy, with their eyes?
CK_4 When do children begin to vocalize in response to someone talking to them?
CK_5 When do children begin to smile socially, that is smile into the face of another person?
CK_6 When do children begin to say single meaningful words?
CK_7 When do children begin to play imaginary play like feeding a doll or driving a toy car?
CK_8 When do children begin to reach for a toy in front of them?
CK_9 When do children begin to grasp tiny things like raisins, with their fingertips?
CK_10 When do children begin to walk alone with good  co- ordination?
CK_11 When should mothers begin to talk to children?
CK_12 When should mothers begin to show colorful objects to children to help them practice reaching?
CK_13 When should mothers begin to teach children to count?
CK_14 When should mothers begin to teach children colors? 
CK_15 When should mothers start to give children a spoon or a fork to let them eat by themselves?
CK_16 When should mothers begin to give children paper and crayons to draw and color?
CK_17 When should mothers begin to let children sit with support?
CK_18 When should mothers begin to give children clean and safe objects or toys which they can mouth?
CK_19 When should mothers begin to look at children’s books with their children?
CK_20 When should mothers begin to give children clean and safe household items to play with?
CK_21 In the past 3 days, did you or any household member over 15 years of age engage in any of the following activities with CHILD (name): If yes, ask: who engaged in this activity with  CHILD (name)?  Mother=1, Father=2, Other=3, No=4
CK_21_a Read books to or looked at picture  books with CHILD (name)?
CK_21_b Told stories to CHILD (name)?
CK_21_c Sang songs to CHILD (name) or with (name),including lullabies?
CK_21_d Took CHILD (name) outside the home,  compound, yard or enclosure?
CK_21_e Played with CHILD (name)?
CK_21_f Named, counted, or drew things to or with CHILD (name)?