What would not be considered a quality attribute?

Cost is not typically classified as a quality attribute because quality attributes refer to specific characteristics of a software product that measure how well it performs its intended function. These attributes, such as reliability, performance, and usability, directly relate to the user experience and the software's operational capability.

Reliability encompasses the system's ability to function under expected conditions without failure, while performance relates to how quickly and efficiently the system performs tasks. Usability focuses on how easy the system is for users to understand and operate. In contrast, cost pertains to the financial aspects of software development and maintenance rather than a characteristic of the software’s performance or quality. Hence, while cost can influence decisions about quality attributes, it does not itself fall under the umbrella of quality attributes.