An exploratory study was made to investigate factors possibly related to adoptive families' and adoptive single parents' decisions about participation in a new postplacement support service. Factors under consideration included family background, existing informal supports, attitudes toward mental health professionals, and perceptions of the specific postplacement service. The service under investigation was an adoption bonding program, a variant of family therapy designed to help the family adopting an older child readjust as a new system and build new relationships. Each adopting family was administered an interview schedule and questionnaires were developed specifically for the study. Each question investigated one of three dimensions: (1) availability and use of supports, (2) perceptions about childrearing and mental health, and (3) perceptions about the bonding program. Several factors were found to be related to participation in the service program, including ethnicity, marital status, availability of supports, and impressions of the program assessed. It was concluded that findings suggest the importance of considering such factors in the design and implementation of postadoptive placement supports. (RH)