Final answer:
Usability testing and user satisfaction testing are key processes in software development for ensuring that the software meets user needs. Through continuous testing and refinement known as the spiral design process, the software is improved until it sufficiently meets the criteria set forth.
Step-by-step explanation:
The process of testing to ensure that the users of the software are satisfied with its functionality is known as usability testing and user satisfaction testing. During this phase, prototypes are tested and evaluated against predefined criteria and constraints to identify any areas that may need improvement. If weaknesses are found, the software design may be refined to address these issues, iterating through the spiral design process until the design meets the users' needs adequately.
As part of the testing phase, emphasis is placed on both the technical performance and user experience. Communication of the testing results can be facilitated through a user manual or by posting designs on a website, ensuring that feedback is incorporated accordingly. This cycle of design, testing, and refinement continues until no further improvements can be made, at which point the software is considered complete and ready for deployment.