This project concerns a large-scale study of incipient social groups that was conducted in 2013. Researchers have previously used real-time tracking to gather data on animals and insects as they forage, hunt, mate, and socially interact. Much of this research employes automated image-based tracking, wherein data on movement and positions are converted from tracking pre-assigned visual objects (e.g. patches of color) over the course of a video record. There is some limited human subjects research that uses environmental manipulations with image-based tracking, but these are only quasi-experimental, and lack information about participants' demographics and psychological characteristics. This study was an attempt to move beyond previous human and non-human tracking paradigms by combining environmental control, precise measurement, ecological validity, and self-report data. Participants—who had previously provided relevant demographic and individual difference data—were unobtrusively filmed in a controlled environment large enough to permit relatively unconstrained behavior (a fully enclosed stadium near the University of Otago). Participants’ position in the video feed was then converted into spatial and movement data (e.g., physical location, speed and acceleration, proximity), which was merged with pretest data containing their attitudes and demographic information. In this particular study, we tested four specific hypotheses about the earliest stages of group behavior. Each of our hypotheses is included as a "component" to this project. In these components, we elaborate on our hypotheses, and include data files (and manuscripts, if data concerning the hypothesis has been published). Here, we list the tasks that participants engaged in throughout our study. All tasks had relevance to at least one of our hypotheses. Some tasks were relevant to multiple hypotheses (e.g. all hypotheses investigated grouping processes in #3). 1. A pre-study mingling period, where we could track participants interpersonal distance. 2. A marching task, where participants followed a male research assistant around the experimental area for 5 minutes. 3. A grouping task, where participants repeatedly formed groups "of any size or composition" 4. A dispersal task, where participants clustered in a tight circle, and were then asked to find "somewhere else to stand in the experimental area." 5. A foraging (cooperation) task, where participants had to pick up 500 washers which were scattered across the experimental area, with knowledge that the experiment would not end until all washers had been picked up and deposited in a basin.