The information entropy which indicates a degree of uncertainty is useful to discuss design alternatives in structural reliability problems. (1) A question has arisen on a design decision process. Which one should be employed if two alternatives have a same level of reliability, but have noticeably different degrees of uncertainty. (2) A question has also arisen on which one is more enriched with the redundancy, if statically indeterminate systems have a same reliability, but failure modes to the overall collapse are different. This study will answer the two questions by demonstrating how useful the concept of the information entropy is as a measure of information on an redundancy of structural or more generally engineering systems.
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