Contextual explanation: Independent body ensuring standards in higher education. 
A quality assurance agency, such as the QAA for Higher Education, is best understood as an institution—specifically, an established organisation tasked with maintaining and enhancing the quality and standards of higher education. Its role involves evaluating academic practices, setting benchmarks, and providing oversight to ensure that educational institutions meet defined criteria for excellence and integrity.

Themes: Oversight and accountability. 
The theme of oversight is central, as quality assurance agencies are responsible for monitoring and evaluating the performance of higher education providers. Accountability is also a key theme, since these agencies ensure that institutions are answerable for the quality of their educational offerings and compliance with national or sector-wide standards.

Nuance: External, independent evaluation. 
What distinguishes a quality assurance agency within its category is its external and independent status. Unlike internal quality processes, these agencies operate at arm’s length from the institutions they assess, providing impartial judgments and recommendations that support continuous improvement and public trust in higher education.