### Figure 8.6

# NASA Task Load Index

Hart and Stavelands NASA Task Load Index (TLX) method assesses
work load on five 7-point scales. Increments of high, medium and low
estimates for each point result in 21 gradations on the scales.

Name: Task: Date:

### Mental Demand

How mentally demanding was the task?

Very LowVery High

### Physical Demand

How physically demanding was the task?

Very LowVery High

### Temporal Demand

How hurried or rushed was the pace of the task?

Very LowVery High

### Performance

How successful were you in accomplishing what you were asked to do?

PerfectFailure

### Effort

How hard did you have to work to accomplish your level of performance?

Very LowVery High

### Frustration

How insecure, discouraged, irritated, stressed, and annoyed were you?

Very LowVery High