Developed as part of the Milieu Language Teaching Project at the John F. Kennedy Center at Vanderbilt University in Nashville, Tennessee, this KIDTALK Behavior-Language Coding Protocol and manual measures behavior occurring during adult-child interactions. The manual is divided into 5 distinct sections: (1) the adult behavior codes describe specific adult language and nonverbal behaviors; (2) the child behavior codes describe specific child language and nonverbal behaviors; (3) miscellaneous codes describe environmental events, pauses in adult and child interaction, interruption by the interventionist, or unusual events; (4) the coding and summarizing of behavioral episodes; and (5) the summarizing of all coded data. An appendix contains samples of transcribed, coded, and summarized KIDTALK data. (RS)