This paper will present some recent thoughts and experience directed toward simplification of the methods of developing subjective ratings of partition walls. Any such scheme will depend on the nature of the sound sources: speech, musical instruments, radio and television, machinery equipment, and apparatus, etc. Of these the most discussed is speech. Parkin has proposed and used a frequency weighting curve; Farrell and Watters, an articulation scoring scheme. The present paper presents somewhat simplified and similar ideas which lead to, for example, a parameter called “speech leakage index.” This evolves from a weighted average of the data taken at standard STL and NR frequencies. The same scheme with different weighting factors can be applied to other sound sources such as music and equipment noise. The measurement and evaluation of school room partition isolation given in the previous paper has presented an opportunity to check these assumptions. The results will be presented.