What are the assumptions of the execution-time component model?

The execution-time component is based on the several assumptions:

(1) Tests show the environment in which the program will be used.

(2) All failures are experiential.

(3) Failure intervals are s-independent of each other.

(4) Hazard rate is a similar that changes at each fault correction.

(5) The failure rate is proportional to the s-expected value of the number of faults remaining.

(6) The fault-correction occurrence rate is proportional to the failure-occurrence rate. Both rates are with respect to implementation time.