This study explores how often students are engaged in their science classes and their affective states during these times, using an innovative methodology that records these experiences in situ. Sampling a subset of high schools in the U.S. and Finland, we collected over 7,000 momentary responses from 344 students over the course of a week. We examine engagement within and between students in different environments identifying common social and emotional factors they may be experiencing in their science classes, suggesting the challenges that the U.S. and Finland may encounter when implementing their new science standards (i.e., Next Generation of Science Standards and Finnish National Core Curriculum). We operationalize engagement as situational when students experience high levels of challenge, skill, and interest, which we term as optimal learning moments. Specifically we analyze: (i) the components of optimal learning; (ii) the relationship of optimal learning with other subjective measures; (iii) how optimal learning moments in science classes compare to other academic classes; and (iv) the extent that optimal learning moments predict an individual's perception of importance to self and future in science classes. Using several multivariate models, results show that when students are challenged in their classes and are appropriately skilled they are more likely to feel confident, successful, and happy during specific science classes as well as in other academic classes. When students experience more times of optimal learning in their science classes they are more likely to report that they perceive science as important to them and their futures. Females, however, report being more stressed in their science classes than males. # 2015 Wiley Periodicals, Inc.

The decreasing number of students who are engaged in science learning has been recognised as a problem. The pre-conditions of engagement and actual engagement were examined using a novel research method to obtain detailed information on Finnish students' engagement in different situations and to gain a better understanding of this phenomenon. The study's participants consisted of 68 students (31 girls, 37 boys) from 9 th grade and 67 students (46 girls, 21 boys) from 1st grade in upper secondary school. The research aimed to answer the following question: How does Finnish students' engagement occur in exact and life science lessons? Participants received smartphones equipped with a smartphone application that included an experience sampling method questionnaire. The smartphones were programmed to emit a signal during every science lesson and otherwise randomly [193] 11(2), 2015 during the day (from 8 am to 8 pm). The results reveal that situation and grade had significant effects on students' pre-conditions of engagement and actual engagement. Our results also show that girls had the highest interest in life science lessons and boys in exact science lessons. Finnish Students' Engagement in Science Lessons BARBARA SCHNEIDER