Abstract: Embodiments of the present invention disclose a method, computer program product, and system for evaluating the reliability of an activity forecast. A computer identifies forecast information for an activity, where the forecast information can include at least one forecasted time duration to finish the activity, an actual time duration of the activity, a highest forecasted time duration of the activity, and an individual that provided the identified forecast information. The computer utilizes the forecast information to generate a normalized Cartesian plot of the identified forecast information. The computer determines a best-fit line for the normalized Cartesian plot. The computer determines a variance between the best-fit line for the normalized Cartesian plot and the actual time duration of the activity. The computer determines an accuracy rating corresponding to the variance of the forecast information.