What is a potential drawback of step scanning as a method?

Step scanning is a method used in assistive technology, often for individuals with limited mobility, to facilitate interaction with devices. One of the notable drawbacks of step scanning is that it can lead to motor fatigue. This technique often requires users to engage in repeated physical movements, such as stepping or pressing switches at each scan interval while waiting for the desired selection.

As the process may involve extensive arm or leg coordination, particularly for individuals with limited endurance or strength, prolonged use can result in tiredness and discomfort. This might detract from the overall experience and hinder the user’s ability to operate the device effectively over an extended period. Therefore, while step scanning can be a viable method for some users, the potential for motor fatigue is a significant consideration in its application.

The other options do not accurately capture the primary concern associated with step scanning. For example, the cognitive involvement may vary, and engagement depends on the user's proficiency and context rather than being a fundamental limitation of the method itself. Similarly, while the speed of step scanning may not suit everyone, it is not universally considered too quick, as the method can be adapted to varying user needs.