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This article describes the design of a misconception diagnostic test about fire-related phenomena. It proposes a new test format in which a certainty-measuring tier has been integrated into each of the true/false response choices. This format is argued to be easier for teachers to use than the increasingly popular three-tier format. First, we review the available literature about misconception diagnostic tests and then literature about firerelated misconceptions. We then describe the design process of the test, which was preceded by an interview phase. We then describe its administration to 221 secondary school students. We finally present, in an explorative and accessible manner, the results that were obtained. These results support the existence of previously recorded misconceptions, but also bring certain nuances to some of their previous interpretations. They also support the hypothesis according to which some misconceptions are presumed to be more widespread than they truly are. Conclusive remarks are formulated about the benefits of the use of our-and othermisconception diagnostic tests.

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This cross-lagged longitudinal study was conducted with 862 seventh and eighth graders (secondary school) in the province of Québec (Canada) to study the effects of two important perceptual variables (self-concept and individual interest) on achievement, as well as reciprocal relations between all these constructs. Considering the results obtained previously in mathematics education, it was designed to test if the same inter-variable dynamics could be recorded in science and technology. The data was gathered at 10 time points (four perceptual; six report cards [school reports]) and analyzed using Mplus. Most fit indexes were acceptable and revealed a predictive solution that supports the hypothesis that interest does not appear to play any direct role in achievement, but that self-concept does. Recommendations for research that tests individual interest are formulated as well as suggestions for educational practice.