Test of spelling ability of trainees in Mannheim and Ludwigshafen at two different points in time. Summarized data set of the two investigations conceived partly as panel and partly as trend investigation. Test of spelling ability of trainees in Mannheim and Ludwigshafen. Topics: Feldhaus spelling test in version 79 with 80 test words to be written correctly (multiple-choice questions). Demography: birthdate; sex; chamber of commerce district; school last attended; school degree; state of school last attended; German instruction at the vocational school. The following indices were additionally included: total number of errors and types of errors.