Measures

PropertyMeasure

Speed

Processed transactions/second;

User/Event response time;

Screen refresh time.

Size

K Bytes;

The number of RAM chips.

Ease of use

Training time;

The number of help frames.

Reliability

Mean time to failure;

Probability of unavailability;

Rate of failure occurrence;

Availability.

Robustness

Time to restart after failure;

Percentage of events causing failure;

Probability of data corruption on failure.

Portability

Percentage of target-dependent statements;

Number of target systems.

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