A task analysis is a detailed description of all of the activities that you do within a period of time. It is most commonly used to explain job requirements of a particular job but it can be used in a variety of other situations.
You are going to do a brief task analysis. Pick one hour of your day. It can be at home, at work, or at school. Write down every single thing that you do every time that you do it for that one hour. The list should include everything from the major activities down to the insignificant ones. All activities, whether planned or unplanned, should be listed. The resulting detailed chronicle is an example of a task analysis for you for that specific day and time.