Chapter 7

Question 1

What was the first interaction style?

Answer 1

Command line

Question 2

2 traits of using command-line:

Answer 2

• Users will rely on recall rather than recognition.
• Users must initiate rather than respond.

Question 3

4 Advantages to command-line:

Answer 3

• Direct access to system functionality
• Useful for repetitive tasks
• Good for expert users
• powerful

Question 4

4 Disadvantages to command-line:

Answer 4

• Requires extensive training.
• Needs precise syntax.
• More room for error.
• It is text-only.

Question 5

3 reasons why excessive functionality is a design error:

Answer 5

• It slows learning.
• More room for error.
• requires more tutorials and help.

Question 6

3 ways to organize commands in command-line:

Answer 6

• Simple command set: each command is chosen to carry out a single task.
• Command + arguments/options: Follow each command with one or more arguments (COPY FILE A, FILE B, DELETE FILE A)
  High error rates and low learnability, but more powerful
• Hierarchical command structure: The full set of commands is organized into a tree structure. Easier to use and learn because it’s more consistent.

Question 7

4 Advantages to natural language:

Answer 7

• Requires less training.
• Easy to use
• Users don’t have to learn commands, syntax, menus etc.
• Suitable for novice users who know the task domain well.

Question 8

4 disadvantages to natural language:

Answer 8

• Difficult to program.
• Speech recognition problems.
• Some different words may sound the same. ex: “Carrot” and “Caret”.
• You can disturb the people around you.