### **Summary**: Large-scale collaborations have had a recent resurgence in the field of social and personality psychology. Like any data collection method, these efforts have both strengths and potential drawbacks. Large collaborations offer strengths in statistical power and variety of skill sets. Moreover, recent examples of such collaborations have yielded unique insights in the cross-cultural and meta-scientific domains of psychology, among others. However, these endeavors are often costly, time consuming and logistically difficult. Speakers in this symposium are leaders of large-scale collaborative projects and will discuss methodological and theoretical strengths and weaknesses in the design and management of large-scale collaboration projects. First, Jon Grahe will review a series of Open Invitation, Open Science projects specifically designed for undergraduate researchers. This will include a brief review of the benefits and costs of providing authentic research experiences as part of undergraduate education as well as consider the past and potential impact these projects as meta-science projects evolve. Mallory Kidwell will then present on the methodological challenges as well as the collaborative strengths unique to managing the Reproducibility Project: Psychology (RP:P), a meta-science effort by 270 coauthors to replicate 100 findings in published psychology literature. Gwen Gardiner will present on the International Situations Project, a 64-country study investigating within and between culture differences in situational experience, daily behavior, and personality. Finally, Hannah Moshontz will introduce The Psychological Science Accelerator (PSA), which aims to make large, multi-site, collaborative studies commonplace, and describe its novel and unique features, benefits, and challenges as well as explain the process of selecting, planning, and implementing a study with the PSA. This symposium, in part, serves as a resource to researchers considering beginning a large-scale collaborative project, and will contribute to the conversation on transparency, openness and reproducibility as it relates to any collaboration across the research process.