The literature review for the Professional Development Tools to Improve the Quality of Infant and Toddler Care (Q-CCIIT PD Tools) project summarizes the state of the field, highlighting the most promising methods and approaches for enhancing caregiver interactions with young children, particularly caregivers serving infants and toddlers, those with limited education, and those in home-based and family child care (FCC) settings. The review is not exhaustive; instead, it identifies the professional development (PD) resources and components most pertinent to the development of new PD tools and the project's conceptual framework. It draws on 122 studies, including 31 focused on caregivers serving infants and toddlers and 26 with caregivers in home-based or FCC settings. In this set of appendix tables, we summarize key aspects of each study included in the review. A separate report, "Professional Development Tools to Improve the Quality of Infant and Toddler Care: A Review of the Literature," highlights key findings from the review and their implications. (author abstract)