The document discusses task analysis, which is the process of analyzing how people perform jobs by examining what tasks they perform, what objects they use, and what knowledge they require. It describes two main approaches to task analysis: task decomposition, which breaks tasks down into ordered subtasks, and knowledge-based techniques, which examine what knowledge a user needs to complete a task. One example of task decomposition provided is hierarchical task analysis (HTA), which structures tasks in a hierarchical tree with subtasks. The document also discusses different types of task plans and provides an example knowledge-based task analysis of motor controls in a vehicle.