Does task sustainability provide a unified measure of subjective task difficulty?

Area of Science:

• Cognitive Psychology
• Human Factors Engineering
• Decision Science

Background:

• Subjective task difficulty is often assessed using ad hoc measures like completion rates or attention required.
• A common underlying basis for judging the relative difficulty of diverse tasks is hypothesized.
• Understanding this basis could enable standardized comparison of task difficulties.

Purpose of the Study:

• To investigate the common basis for subjective task difficulty.
• To test two hypotheses: task difficulty is indexed by time, or by estimated sustainability.
• To determine which factor, time or sustainability, better predicts perceived task difficulty.

Main Methods:

• Participants' subjective task difficulty was assessed.
• Two hypotheses regarding the basis of task difficulty were empirically tested.
• Data analysis focused on the correlation between perceived difficulty and proposed underlying factors.

Main Results:

• Results showed consistency with the hypothesis that time serves as an index of task difficulty.
• The data provided less support for the hypothesis that estimated sustainability underlies subjective task difficulty.
• Time emerged as a more robust predictor of perceived task difficulty than sustainability.

Conclusions:

• Time appears to be a significant common basis for judging subjective task difficulty.
• The estimated sustainability of a task is a less reliable indicator of its perceived difficulty.
• Future research could explore the interplay between time, sustainability, and other cognitive factors in task difficulty perception.