Question 11/II - Terms and definitions for Quality of Service, dependability and teletraffic engineering (Revised Question 25/II from 1985-1988 period) Considering 1. that Recommendation E.800 gives terms and definitions for Quality of Service, network performance and related performances; 2. that Recommendation E.600 gives terms and definitions for use in the field of teletraffic engineering; 3. that Recommendation E.100 gives terms used in international telephone operation; 4. that Supplement X gives terms and definitions for dependability and related concepts as well as for statistical concepts; 5. that Quality of Service, dependability and traffic engineering work within CCITT is being studied for an expanding range of applications; 6. that the E-Series Recommendations may contain inconsistencies between existing definitions, What new and revised definitions are required in Recommendations E.100, E.600, E.800 and Supplement?