Abstract:  Tardast (Shakeri 2003; Shakeri & Funk, in press) is a new and intriguing paradigm to investigate human multitasking behavior, complex system management, and supervisory control.  We present a replication and extension of the original Tardast study that assesses operators’ learning curve and explains gains in performance in terms of increased sensitivity to task parameters and a superior ability of better operators to prioritize tasks.  We then compare human performance profiles to various artificial software agents that provide benchmarks of optimal and baseline performance and illustrate the outcomes of simple heuristic strategies.  Whereas it is not surprising that human operators fail to achieve an ideal criterion of performance, we demonstrate that humans also fall short of a principally achievable standard.  Despite significant improvements with practice, Tardast operators exhibit stable sub-optimal performance in their time-to-task allocations. 

Keywords:  Multitasking, supervisory control, Tardast, stable suboptimal performance (SSP), rational task analysis (RTA).

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