The possible roles of culture, gender, and age-related factors in decision making about socioscientific issues (SSIs) have been underexplored. To study the impact of culture and cross-cultural understanding on students’ decision-making, and how these impacts are possibly mediated by age and gender-related variables, 106 11–13 year old students and 60 15–17 year old students from three Hong Kong schools and four UK schools were engaged in decision-making about shark fishing. Data were collected on how students make decisions before and after interacting with their own peers and considering the views of their international counterparts, using discussion records, supplemented with focus group interviews. The findings show that students associated with the culture of shark eating do not necessarily identify with shark fishing. Three dimensions characterise students’ decisions: the human activities to be controlled, the ways to address issues arising from shark fishing, and the concerns underlying students’ decisions. Although students showed support for conserving sharks, there were nuanced differences between the two cultural groups, which were possibly mediated by gender and age factors. The findings provide support to the impact of cultural exchange on their own and others’ views on broadening students’ perspectives and stimulating their critical reasoning. Copyright © 2019 Informa UK Limited, trading as Taylor & Francis Group.

The study explores secondary students' decision making about socio-scientific issues (SSIs) related to biological conservation, from cross-cultural, cross-age and cross-gender perspectives. It has been widely recognized that many SSIs have profound repercussions on global environmental sustainability that transcend cultural boundaries. Research on SSIs has been focused on multi-perspective reasoning, the evaluation of evidence, value judgement, and the formulation of the criteria for decision-making, but not on the possible roles of culture, gender, and age-related developmental factors as mediators of students' decision making. This study was to fill this gap. It adopted a comparative perspective and used mixed methods including student worksheets, class discussion records and focus groups. A total of 97 HK students, with 55 aged 11-13 and 42 aged 15-17, and 54 UK students, with 41 aged 11-13 and 13 aged 15-17 were involved in decision making about shark hunting within their own classes, and in cross-cultural exchange between HK and UK classes. The aim was to study gender, cultural and age-related differences in students' decision-making about shark hunting, and the impact of cultural exchanges through watching videotaped presentations from another locality. Preliminary findings showed that while nearly all the students in both localities agreed to protect sharks to different extents, there were differences across age, gender and culture in various aspects of their decisions including their justifications. For instance, there was statistically significant difference in the number of concerns on which the justifications of HK and UK junior students were based upon; UK senior students targeted at a wider range of stakeholders in their final decisions than their HK counterparts; and far more senior students in both localities resorted to education as a means to protect sharks than their junior counterparts. More junior students in both localities thought they needed