D. Participating States ................................... II. METHODOLOGICAL ISSUES ...................................... A. Introduction ........................................... B. Construction of price indexes .......................... C. Construction of purchasing-power parities .............. D. Problems specific to military expenditures ............. III. COLLECTION AND TREATMENT OF DATA ........................... A. Introduction ........................................... B. Operating costs ........................................ 1. Collection of data ................................ 2. Treatment of data ................................. 1 - 23 1 - 14 15 16 - 21 22 - 23 24 - 44 24 - 25 26 - 34 35 - 42 43 - 44 45 - 98 45 - 54 55 - 74 55 - 64 7 7 10 10 11 12 12 12 13 16 17 17 18 18 65 - 74 22 Page 4 5 A/40/421 English Page 3 Contents (continued) Paragraphs Pase C. Procurement and construction . . . . . . . . ..*................ 75 - 90 24 1. Collection of data . . . . . . . . . . . . . . ..*................ 75 - 82 24 2. Treatment of data . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...*.. 83 - 90 32 D. Research and development ..a.....................*....... 91 - 98 35 1. Collection of data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91 - 95 35 2. Treatment of data .................................. 96 - 98 36 IV. RESULTS, ANALYSIS AND POSSIBLE FURTHER IMPROVEMENTS ........ 99 - 137 38 A. Introduction . . . . . . . . . ..*.........................*..... 99 - 107 38 B. Price indexes . . ..I...*............................*.... 108 - 116 43 