He was incapable of performing even the most trivial task.
All procedural texts are steps to completing a task. They may be vary in complexity, but they are all a step-by-step in reaching a goal. But its always a detailed guide to help you do it. Hope this helped.
About 20-50% of consumed calories are used for brain function. Studies have been done showing the people with higher IQs may use less energy for a given task (that has already been learned) than people with lower IQs. Of couse, the amount of energy used by the brain also depends on the tasks performed and how much brain activity is involved in each task (harder tasks may require closer to 50% of calories while simple tasks may only need 20%). Individuals are also variable, so different brains may take up different proportions of calories in different people.
Whichever piece of equipment will make the task take up as little as your time as possible so you can meet targets and deadlines, and also the equipment that will help you to complete the task to the best standard. Also not one piece of equipment can do everything , so you may need various types of office equipment to complete a task.
you may ask that person what's their hair color, tell them to follow a moving pen with their eyes, listen and follow direction while performing a task, what's their name etc. etc.