The Parent Problem Checklist (PPC) is used to help measure parental adjustment but using its 16-item questionnaire measuring inter-parental conflict over child rearing issues, with the questions in a yes/no format, but a Likert-scale is also added in to describe the extent to which a problem occurs.
To see the Parent Problem Checklist click here.
To read more about the Parent Problem Checklist, check out these two articles:
Dadds, M. R., & Powell, M. B. (1991). The relationship of interparental conflict and global marital adjustment to aggression, anxiety, and immaturity in aggressive and nonclinic children. Journal of Abnormal Child Psychology, 19(5), 553-567.
Stallman, H. M., Morawska, A., & Sanders, M. R. (2009). Parent Problem Checklist: Tool for assessing parent conflict. Australian Psychologist, 44(2), 78-85.