In this chapter, we discussed creating a GUI for ChefBot that can be used by an ordinary user who doesn't have any idea about the internal working of a robot. We used Python binding of Qt called PyQt to create this GUI. Before we go to the main GUI design, we saw a Hello World application to get an easier understanding of PyQt. The UI design was done using the Qt Designer tool and the UI file was converted into its equivalent Python script using Python UI compiler. After designing the main GUI in Qt Designer, we converted the UI file into Python script and inserted the necessary slots in the generated script. The ChefBot GUI can start the robot, select a table number, and command the robot to get into that position. The position of each table is acquired from the generated map we hardcoded the positions in this Python script for testing. When a table is selected, we set a goal position on the map, and when we click on the Go button, the robot will move into the goal position. The user can cancel the operation at any time and command the robot to come to the home position. The GUI can also receive the real-time status of the robot and its battery status. After discussing the robot GUI, we saw the debugging GUI tool in ROS called rqt. We saw some plugins used for debugging the data from the robot. In the next chapter, we will see the complete testing and calibration of the robot.