Early computer systems relied on command-line interfaces to perform all actions. Today, the majority of systems use direct manipulation rather than a command-line interface. The goal of designing a direct manipulation interface is to make use of the system intuitive to the end-user.

One industry that has been extremely successful in designing intuitive direct manipulation inputs is the video game industry. Most game players are able to learn controls as they play a game and then apply the same controls to similar games. Rarely do they need to read a user manual.

Write a paper in which you:

1. Describe the three principles of direct manipulation and give examples as to how they are used in video game controls.
2. Analyze video game-type interfaces and discuss three reasons why video game-type interfaces would not be effective for real-world applications.
3. Describe at least three advantages of direct manipulation versus command-line interfaces.
4. Evaluate direct manipulation and describe three problems with it.