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Integrity as a software quality factor primarily relates to the ability to ensure that unauthorized access to software is controlled. In the context of software development and quality assurance, integrity encompasses the measures in place to protect the software from unauthorized manipulation or access, thereby maintaining the accuracy and reliability of the software’s functions and data.

When integrity is properly implemented, it safeguards the information and ensures that only authorized users can access or modify the software. This is crucial in maintaining trust among users and stakeholders, particularly in applications where sensitive data management is involved.

While performance speed, hardware-software interface details, and completeness of documentation are important aspects of software quality, they do not directly pertain to the concept of integrity. Integrity specifically focuses on protecting the software's processes and data from unauthorized actions, making it a fundamental component of security within software quality.