The purpose of this study is to see how second-language learners uses noun phrases in their written texts and oral speech as well as how they differ from each other. In order to answer this, the following questions have been formulated: What congruent errors are found in the noun phrases in the students' texts and oral speeches? Are there any differences in the use of noun phrases in the students' texts and oral speeches? The study is based on performance analysis, where student texts and transcribed recordings of students' oral speeches are analyzed. The result shows that congruence errors in the students' noun phrases are mostly due to the misuse of gender, definite form and numerus. The result also shows that the students had more congruence errors in the written texts, but there were similar, but fewer, mistakes in the oral speeches. This means that you cannot draw general conclusions about any differences between the written texts and the oral speeches.