本推荐做法有助于评估短时间电影材料（通常是长度不超过三分钟的商业广告和预告片）的主观响度。它没有规定此类材料的最大建议水平，仅旨在描述测量方法。

This Recommended Practice assists in assessing the subjective loudness of short duration motion picture material, typically commercials and trailers that do not exceed three minutes in length. It does not specify a maximum recommended level for such material, and is solely aimed at describing a measurement method.