In a UML process model, which of the following statements regarding a task is NOT accurate?

In a UML process model, a task is represented as a rounded rectangle, not a square. This graphical representation is designed to clearly differentiate tasks from other elements within the model. Rounded rectangles are commonly used in UML diagrams to signify activities or actions within a process, creating a visual distinction from elements such as decision points or start and end events, which have different shapes.

While tasks can indeed overlap swim-lanes, each task typically signifies a specific activity carried out by an actor. Validating tasks by actors is important to ensure the accuracy and appropriateness of the activities being carried out, as actors play a critical role in the execution of these processes. Additionally, identifying a task by observing actors aligns with the concept that tasks are often assigned to individuals or groups responsible for them, making it possible to recognize what is being done when observing the performers of the tasks.