The purpose of this study is to investigate the Life Sciences course decision-making skill of the 3rd grade primary school students as evaluated by the parents. The study was conducted in screening model. The participants of the study were the parents (41 mothers and 26 fathers) of the students (32 girls, 35 boys) who study in the center of the province of Adiyaman in the academic year of 2017-2018. In order to collect the data, "decision-making skill level" survey form, which evaluates the decision-making gains of the 1st and 2nd grade Life Sciences course, was used. According to the findings, the decision-making skill of the students was 94.54 out of 120, which is "very good." The decision-making skill levels of the students did not show a significant difference depending on the parent variable (mother or father), the students' gender, or the school type attended (central or disadvantaged neighborhood). Depending on their success in school, however, there was a significant difference in their decision-making skill levels; a positive correlation was detected between the decision-making skill and the success in school. The decision-making skill of the students did not show a significant difference depending on their self-confidence level or their success in the Life Sciences course.