We collected four-season consecutive 7-day weighed dietary records (28-day WDRs) during 1996-1997 from 107 Japanese dietitians, and compiled 2,925-day WDRs and 149,187 lines for foods and weighed data. Of 1,160 foods consumed, 414 foods were difficult to code because they were precooked or unlisted in the Japanese Standard Composition Table (JSCT). There were 1,112 cording errors in 73,266 lines reported in Spring and Summer surveys. Our data-base for foods often erroneously coded has been found very useful. Verifying interviews about dietary records with a manual appeared prerequisite for food coding and weighing. Either overestimation or underestimation of nutritional intake could occur for foods unlisted on the JSCT, and therefore model recipes for commonly taken dishes appear necessary. Thus, in order to secure valid WDR surveys, a standardized manual/guideline for manual/computer-assisted data checking, coding, data processing, preparing standard recipes is to be recommended.