The study aims to investigate oral-language features in writing by students at a highschool level. It also aims to examine the use of speech-language between the universitypreparatory and vocational programs. Methods such as questionnaires and text analysiswere used to answer the research questions. The results show that all the study'scategorized speech-language features occur in students' writing, and of the selectedfeatures within the categorizations, the occurrence varies. When speech-languageappeared, it occurred frequently. The prevalence of speech-language features is higherwithin vocational preparation than in university preparation programs. According toteachers, spoken language occurs in students' writing, it can vary between occurrence,speech-language features, and program orientation. In summary, spoken language is afrequent occurrence in students' writing and it occurs more often in vocational preparationprograms than in university preparation.