B = 自身
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罗列MSB价格组合:
M = W(工作中心)
M = W + C(子项)
S = O(S)(自身)
S = O(S)+ WS = O(S)+ C
S = O(S)+ W+C
B = O(B)
共7个组合
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进一步分析测试单元,拆分非必须项W和C。
工作中心 = W
子项 = "M" + "S" + "B"
C = M
C = B
C = S
C = M + B
C = M + S
C = S + B
C = M + B + S
C共7个组合