Determine the levelness and plumbness of surfaces.

Determination should include

• using a level
• checking the horizontal surface for levelness
• checking the vertical surface for plumbness
• reading a spirit level and noting whether the bubble is off-center. 

Process/Skill Questions:

• What is the difference between level and plumb?
• What are the different lengths of levels used?
• What are the possible consequences of failing to determine levelness and plumbness of surfaces?