Metrics. "A science is as mature as its measurement tools." -- Louis Pasteur. Starter Questions. What can we measure? What value can those numbers have?. Why Measure?. accurate estimation how productive are we quality improvement what do we do well
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"A science is as mature
as its measurement tools."
-- Louis Pasteur
n1 = the number of distinct operators
n2 = the number of distinct operands
N1 = the total number of operators
N2 = the total number of operands
Program length N = N1 + N2
Program vocabulary n = n1 + n2
Volume V = N * (LOG2 n)
Difficulty D = (n1 / 2) * (N2 / n2)
Effort E = D * V
Software System Independence
Version 2 Version 1
Module# Defects LOC Defects/LOC Defects LOC Defects/LOC Relation
1 12 777 0.01544 3 55 0.05455 <
2 5 110 0.04545 6 110 0.05455 <
3 2 110 0.01818 3 110 0.02727 <
4 3 110 0.02727 4 110 0.03636 <
5 6 1000 0.00600 70 10000 0.00700 <
Sum 28 2107 0.01329 86 10385 0.00828 >
To do something well, we must understand what we are doing. To understand something, we must be able to measure it.
We can measure what we are building and we can measure our building process.