The definition of what qualifies as "feature creep" varies among end users, where what is perceived as such by some users may be considered practical functionality by others.[2] Feature creep is one of the most common sources of cost and schedule overruns.[3][verification needed] It thus endangers and can even kill products and projects.
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^Davis, F.D.; Venkatesh, V. (February 2004), "Toward preprototype user acceptance testing of new information systems: implications for software project management", IEEE Transactions on Engineering Management, 51, 51 (1): 31–46, doi:10.1109/TEM.2003.822468, ISSN0018-9391, S2CID1204079