bug density index value calculation device and bug density index value calculation method

摘要

PROBLEM TO BE SOLVED: To calculate a quantitative index value for determining quality guarantee of software having functions expanded repeatedly.SOLUTION: A bug density approximation value calculation part 12 calculates a bug density approximation value by index approximation on a bug density actual result value, and a variance allowed value calculation part 13 finds variance of each version by dividing the bug density actual result value by the bug density approximation value, and calculates a variance allowed minimum value and a variance allowed maximum value from an average of logarithmic value of the variance and a standard deviation, and a bug density index value calculation part 14 calculates a bug density index value of a next version by multiplying a bug density approximation value of the latest version by a difficulty evaluation value, a variance allowed minimum value, and a variance allowed maximum value of the next version. Consequently, a quantitative index value can be calculated which is used to determine quality guarantee of software having functions extended repeatedly in a test process during next-version development of the software.