Choose from the Five basic types of performance metrics: Task success, Time on task, Errors, Efficiency, Learnability, what type of performance metrics will be appropriate in the following scenarios?

1. The successful online signing of a smartphone contract.

2. Completing a given website task in a usability study with some assistance or with plenty of assistance.

3. Completing the full smartphone order is quick or takes longer than expected.

4. Being required to start over signing the contract.

5. Choosing the wrong model smartphone.

6. Having to use the mouse 5 times to find the right make and model of smartphone you want.