Question 15/XII - Loudness rating, algorithm and application rules (continuation of Question 15/XII studied in 1985-1988 new wording) Considering (a) that the concept of loudness rating will be widely adopted by administrations for their transmission planning and assessment of speech transmission quality; (b) that a basis for the application of loudness ratings has been given in the P- and G-Series Recommendations (particularly Recommendation P.79); (c) that the telephone networks will grow more complex and be fitted with more varied features: -what changes and additions are needed in the loudness rating calculating rules in order to provide administrations with viable planning and evaluation tools?