Although these are not design flaws, human error must be considered when designing an interface. The list below consists of common human and environmental factors that can result in human error. See Case Studies for examples where these factors cause disasters. Attempts should be made to help combat and diminish the following:
A main cause of human error is when users are inexperienced with the system or product. Many times this is due to a lack of in-depth training or simply being new to the product. The importance of training and/or user friendly training manuals is incomparable.
Poor system or product design can lead to user confusion. Confusion can be very frustrating and stressful for users and cause them to make errors when trying to complete tasks.
Whether stress is from the system/product itself or the environment the user is in, it impacts the decision-making process. Under high stress scenarios, users may make rushed or careless decisions if they can’t find what they need.
Fatigue could impact certain audiences more than others. Audiences such as pilots, shift workers, etc. could suffer from sleep debt on a regular basis and must be accounted for in design. Fatigue decreases cognitive awareness and can lead to many user errors.
Users can become overconfident or bored when completing repetitive tasks, thus leading to a high possibility of error.