Few days have been raining and I haven’t done my laundry. That Saturday morning, I decided to do my laundry at the nearest self-service laundry in Desa Ilmu. I took out my RM20 note and change it into special coins using the Change Machine since the washing machine only accept the special coin to do the operation. I loaded my clothes on one of the empty machines and closed the door. Then, I pushed the button with the label 40C that seems to be the temperature of the water that I would prefer to use. There was a green light appeared on the left of the button to indicate that I have chosen the temperature. The screen on top of all the buttons also displayed the coin needed to start the operation. Before proceeding with the coins, I poured a cup of detergent powder and half a cup of softener into the dispenser on top of the machine. Even though the machine might have it owns detergent and softener, I still preferred to use my own. After that, I took out 7 of the special coins and inserted them one by one into the coin slot. Every coin inserted, the screen displayed the number of coins needed left to be inserted. Once everything settled, I pushed the Start button and the machine started to do the washing. The screen then displayed the time left for the washing operation to be completed. Besides, I can see myself for each step that currently ongoing inside the machine through the green light displayed on each label; Wash, Rinse and Spin. This case study can be related to one of the fundamental design principles which are Discoverability.