There are also numerous unofficial computerized implementations of the NASA TLX. The Official NASA-TLX can be administered using a paper and pencil version, or using the Official NASA TLX for Apple iOS App. When using the "raw TLX", individual subscales may be dropped if less relevant to the task.
#Sandra hart 1980s nasa tlx at nasa ames research center full#
There has been evidence evaluating and supporting this shortened version over the full one since it might increase experimental validity. Many researchers eliminate these pairwise comparisons, though, and refer to the test as "Raw TLX" then. This is multiplied by the scale score for each dimension and then divided by 15 to get a workload score from 0 to 100, the overall task load index. The number of times each is chosen is the weighted score. This requires the user to choose which measurement is more relevant to workload. The second part of TLX intends to create an individual weighting of these subscales by letting the subjects compare them pairwise based on their perceived importance. Mental Demand How much mental and perceptual activity was required? Was the task easy or demanding, simple or complex? Physical Demand How much physical activity was required? Was the task easy or demanding, slack or strenuous? Temporal Demand How much time pressure did you feel due to the pace at which the tasks or task elements occurred? Was the pace slow or rapid? Own Performance How successful were you in performing the task? How satisfied were you with your performance? Effort How hard did you have to work (mentally and physically) to accomplish your level of performance? Frustration Level How irritated, stressed, and annoyed versus content, relaxed, and complacent did you feel during the task? Analysis Providing descriptions for each measurement can be found to help participants answer accurately. These ratings are then combined to the task load index. They are rated for each task within a 100-points range with 5-point steps. There is a description for each of these subscales that the subject should read before rating. NASA-TLX originally consisted of two parts: the total workload is divided into six subjective subscales that are represented on a single page, serving as one part of the questionnaire: Paper-and-pencil version of the NASA-TLX rating scale
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