What term describes an improvement that is functional and useful?

The term that describes an improvement that is functional and useful is "functional utility." This concept refers to how well a property or improvement serves its intended purpose, focusing on the practical aspects that enhance its functionality. When an improvement is deemed to have high functional utility, it means that it effectively meets the needs of its users, contributing positively to overall property value and satisfaction.

Operational efficiency, while related to productivity and effectiveness, specifically pertains to how resources are utilized to achieve maximum output and may not directly address the practical usefulness of an improvement itself. Usability standard typically refers to guidelines or criteria that measure how easy and user-friendly an improvement is, rather than directly addressing its functionality. Serviceability relates to the condition and maintenance of a property but does not explicitly capture the essence of how functional and useful an improvement is. Thus, functional utility accurately encapsulates the importance of an improvement's practical value in its specific context.