The main objective of this thesis was to explore issues related to student achievement motivation in the Swedish TIMSS 2003 (Trend in International Mathematics and Science Study) context. The thesis comprises of five empirical papers and a summary. The expectancy-value theory of achievement motivation was used as the general theoretical framework in all empirical papers, and all papers are concerned with construct validation in one form or another. Aspects of student achievement motivation were measured on a task-specific level (motivation to do well on the TIMSS test) and on a domain-specific level (self-concept in and valuing of mathematics and science) and regressed on test performance. The first paper reports the development and validation of scores from an instrument measuring aspects related to student test-taking motivation. It was shown that a number of items in the instrument could be interpreted as a measure of test-taking motivation, and that the test-taking motivation construct was distinct from other related constructs. The second paper related the Swedish students’ ratings of mathematics test-taking motivation to mathematics performance in TIMSS 2003. The students in the sample on average reported that they were well motivated to do their best on the TIMSS mathematics test and their ratings of test-taking motivation were positively but rather weakly related to achievement. In the third and the fourth papers, the internal structure and relation to performance of the mathematics and science self-concept and task value scales used in TIMSS internationally was investigated for the Swedish TIMSS 2003 sample. For mathematics, it was shown that the internationally derived scales were suitable also for the Swedish sample. It was further shown that ratings of self-concept were rather strongly related to mathematics achievement while ratings of mathematics value were basically unrelated to mathematics achievement. For the science subjects, the internal structure of the scales was less simple, and ratings of self-concept and valuing of science were not very strongly related to science achievement. The study presented in the fifth paper used interviews and an open-ended questionnaire item to further investigate student test-taking motivation and perceptions of the TIMSS test. The results mainly corroborated the results from study II. In the introductory part of the thesis, the empirical studies are summarized, contextualized, and discussed. The discussion relates obtained results to theoretical assumptions, applied implications, and to issues of validity in the TIMSS context.

Die vorliegende Arbeit untersucht die Testteilnahmemotivation von Schülerinnen und Schülern in großangelegten Schulleistungsstudien. Es wurde ein theoretisches Erwartung-Wert-Anstrengung-Modell der Testteilnahmemotivation herausgearbeitet, das in drei empirischen Studien überprüft wurde. Dabei wurde das komplexe Beziehungsgefüge zwischen Erfolgserwartung, dem wahrgenommene Wert des Tests, Anstrengungsbereitschaft und Testleistung untersucht. Datengrundlage der Studie I bildete die erste PISA-Erhebung aus dem Jahr 2000, in der die Testteilnahmemotivation durch Fragen zur Anstrengungsbereitschaft und zum wahrgenommenen Wert des Tests erhoben wurde. In Studie II und III gaben die Jugendlichen, die an der Ländervergleichsstudie im Jahr 2012 teilnahmen, Einschätzungen zu ihrer Erfolgserwartung, dem wahrgenommenen Wert des Tests und ihrer Anstrengungsbereitschaft ab. Die Ergebnisse zeigen, dass Testteilnahmemotivation zur Erklärung individueller Unterschiede in der Testleistung beiträgt (Studie I), auch wenn diverse Hintergrundinformationen der Teilnehmenden berücksichtigt werden (Studie III). Die theoretisch angenommenen Beziehungen im Erwartung-Wert-Anstrengung-Modell wurden fast vollständig bestätigt: Vor allem der wahrgenommene Wert, aber auch die Erwartungen sagten die berichtete Anstrengungsbereitschaft der Teilnehmenden vorher; die Erfolgserwartung und die Anstrengungsbereitschaft wiesen einen Zusammenhang mit der Testleistung auf (Studie II). Im Verlauf eines Leistungstests berichteten die Teilnehmenden im Durchschnitt eine Abnahme in der Anstrengung und dem Wert sowie einen stabilen Verlauf ihrer Erfolgserwartung. Zur Erklärung der Testleistung trug neben der anfänglichen Erfolgserwartung und Anstrengungsbereitschaft auch die Veränderung in der Erfolgserwartung bei (Studie III). Für eine hohe Testleistung ist es wichtig, dass die Teilnehmenden den Test motiviert beginnen und während des Tests selbstsicher bezüglich ihrer Erfolgserwartung bleiben. / The thesis investigates effects of test-taking motivation on test performance in low-stakes assessments. An expectancy-value-effort model of test-taking motivation was developed and tested in three empirical studies. The studies investigated the complex relationship between expectancy for success, perceived value of the test, test-taking effort, and test performance. The database of study I is the first PISA study. Test-taking motivation was assessed with questions about effort and the perceived value of the test. Study II and III are premised on the national assessment study in the year 2012. The students reported their expectancy for success, their perceived value of the test, and their test-taking effort. Overall, the results showed that test-taking motivation explained test performance (study I) although controlling for various students’ background characteristics (e.g., socio-economic background, study III). We found support for nearly all of the theoretically assumed relationships in the expectancy-value-effort model: Expectancy for success and perceived value of the test explained test-taking effort; expectancy for success and test-taking effort had the most pronounced effects on test performance (study II). The students reported, on average, a stable course of expectancy for success over the testing session; perceived importance of the test and test-taking effort slightly decreased within the testing session. The initial expectancy for success and the initial test-taking effort as well as change in expectancy for success explained students’ test performance. Above all, it is crucial that students begin the test with a high level of test-taking motivation and remain confident about a successful test completion to the end of the testing session.