Task similarity and task duration prediction bias paper data-set (Thomas & Konig, 2018; Frontiers in Psychology). Separate SPSS data files for 3 experiments where participants performed 2 tasks 7 days apart and predicted how much time each task would take to complete. The similarity of the tasks and whether participants were told the exact duration of the first task before making a time prediction on the second task were the variables that were manipulated in the research.