The Watches view of the Task Builder debug window, displays all the watches currently active for the task. After each step executes, the watches listed in the view are re-evaluated and updated with their current values.
This view contains two columns:
The syntax of the watch. This can be simply a variable name, or a complex expression.
The result of the watch expression. This is updated with each step execution while the task is running.
You can use the Watches Debug view to add, remove, or change watches. For more information see Using Watches.
Debugging Tasks Overview
About the Debug Window