Editing Mean Opinion Score (section)

=== Early Origins ===

The concept of Mean Opinion Score emerged in the telecommunications industry during the 1970s as telephone networks became more complex and digital transmission methods were introduced. Initially developed by the ITU, MOS provided a standardized way to assess voice transmission quality over telephone networks by aggregating human judgments of call quality.<ref>https://www.telecomtrainer.com/mos-mean-opinion-score/</ref>

The early methodology involved having listeners sit in controlled "quiet rooms" and score telephone call quality as they perceived it. This subjective testing approach had been in use in the telephony industry for decades before formal standardization, reflecting the industry's recognition that technical measurements alone could not capture the human experience of communication quality.<ref>https://en.wikipedia.org/wiki/Mean_opinion_score</ref>