The desk lamp plugs into a wall socket, and when you turn the switch on, the light does not illuminate.
1. Identify the problem. Write the problem in your own words.
2. Describe the expected behavior. How should the desk lamp function?
3. Consider how the system works. Describe how the desk lamp works as a system. Include in your description the source of the electricity, the on/off switch, and the light bulb.
4. Guess the possible causes. Describe at least three possible causes for the problem.
5. Eliminate the obvious causes. Rank the order of the solutions you would try.

Question

The desk lamp plugs into a wall socket, and when you turn the switch on, the light does not illuminate. 
 1. Identify the problem. Write the problem in your own words. 
2. Describe the expected behavior. How should the desk lamp function? 
3. Consider how the system works. Describe how the desk lamp works as a system. Include in your description the source of the electricity, the on/off switch, and the light bulb. 
4. Guess the possible causes. Describe at least three possible causes for the problem. 
5. Eliminate the obvious causes. Rank the order of the solutions you would try.