Decision trees:

may be useful in making effective supplier selection decisions the first$-$time a buying decision is made, but not on repetitive purchases.

may be useful in making effective supplier selection decisions when making repetitive purchases, but not special, one$-$time purchases.

may be useful in making effective supplier selection decisions if probabilities of success and failure are assessed for each option.

are of limited value because options can only be evaluated qualitatively, not quantitatively.

cannot reflect past decisions so they are useless as a decision tool when making repetitive purchases.