The effectiveness of visualizations depends on their feasibility to support the goals and tasks of the user in some particular target domain. In order to fulfill this requirement, task analysis has been characterized as a needful activity during the visualization design cycle; however, there is a lack of artefacts that guides the processing of user tasks to design visualizations. This lack of guidelines may hide the identification of such tasks that should be supported by visualization. This fact is especially relevant in operational environments in which ineffective visualization designs may hinder the acquisition of Situation Awareness (SA) and, therefore, lead to the performance of erroneous operational decisions. With the purpose of overcoming this situation, this chapter presents a set of heuristics for addressing the application of Cognitive Task Analysis (CTA) to identify visualization-supported tasks within this type of environments. The definition of such heuristics has relied on the review of the literature about SA-oriented design, visualization, and CTA, and the application of these concepts during the design of control system interfaces. The final aim is to provide a design framework that helps visualization designers to apply task analysis methods to the design of SA-oriented visualizations.