What are some questions I should ask when purchasing a pool?

When buying a pool, here are some important questions you should ask:
• Will it take longer than 4-6 weeks to finish?
• Is a deposit required?
• Are you licensed and bonded?
• Are references available?
• Do you have your own service department to handle warranty and maintenance issues?
• How many contractors will have to be used? Are the contractors insured? Are they from out of town?
• How many materials are available and how many colors do they come in?
• Do I have a retainage to hold or will I have to pay 100% before the pool is finished?
• Do you charge by square footage or linear footage? The latter charges you for shape.
• Will I see the person who sold me the pool again?