The current article details a position statement and recommendations for future research and practice on planning and implementation intentions in health contexts endorsed by the Synergy Expert Group. The group comprised world-leading researchers in health and social psychology and behavioural medicine who convened to discuss priority issues in planning interventions in health contexts and develop a set of recommendations for future research and practice. The expert group adopted a nominal groups approach and voting system to elicit and structure priority issues in planning interventions and implementation intentions research. Forty-two priority issues identified in initial discussions were further condensed to 18 key issues, including definitions of planning and implementation intentions and 17 priority research areas. Each issue was subjected to voting for consensus among group members and formed the basis of the position statement and recommendations. Specifically, the expert group endorsed statements and recommendations in the following areas: generic definition of planning and specific definition of implementation intentions, recommendations for better testing of mechanisms, guidance on testing the effects of moderators of planning interventions, recommendations on the social aspects of planning interventions, identification of the preconditions that moderate effectiveness of planning interventions and recommendations for research on how people use plans.

To conduct a meta-analysis of studies examining the determinants of behaviors performed by parents to promote the health of their child, termed "parent-for-child health behaviors," based on an extended theory of planned behavior. Specifically, the study aimed to meta-analyze correlations among theory of planned behavior constructs, planning, and past behavior, and use them to test theory predictions and effects of salient moderators. A systematic search identified 46 studies that provided correlations between at least one theory construct and intention or behavior for parent-for-child behaviors. Theory predictions were tested using meta-analytic structural equation modeling. Studies were also coded for candidate moderators of model effects: child age, sample type, time lag between measures of theory constructs and parent-for-child health behavior, study quality, and behavior type, and the proposed model was estimated at each level of the moderator. Results supported theory predictions with attitudes, subjective norms, and perceived behavioral control predicting parent-for-child health behavior participation mediated by intention. Perceived behavioral control and planning also directly predicted behavior, and planning partially mediated effects of intention on behavior. Model effects held when controlling for past behavior, supporting the sufficiency of the theory in this behavioral domain. Few moderator effects were found on relations between theory constructs. Findings identified the social cognition determinants of parent-for-child health behaviors, and highlight the potential processes by which they relate to behavior. The current model signposts potentially modifiable targets for behavioral interventions aimed at fostering parental participation in behaviors that promote the health of their children. (PsycInfo Database Record (c) 2020 APA, all rights reserved).