Task analysis is one of the most frequently carried out activities in human factors engineering and it is generally the basis for the design of user interfaces for products and systems. Link Analysis is a more specific technique that helps you track you track relationships between objects, people, and other entities.
Task analysis is potentially a very complex process that can involve a lot of different activities.
There are a large number of quite distinct techniques that can be used in carrying out task analysis. Our goal here will be to give a simple overview of task analysis and what it does, and we won't focus too much on the details. Figure 4.11 in Chapanis shows a sample task analysis data form. This can be used to categorise and describe different subtasks that will be performed using a system. Note that different steps or categories might be appropriate for describing the tasks in different projects.