Speed Processed transactions/second
User/Event response time
Screen refresh time
Size K Bytes
Number of RAM chips
Ease of use
Training time
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