Seamless learning enabled by mobile computing devices is emerging as an approach to promote ubiquitous authentic learning in science.This study surveys Singapore Primary three students from six schools who have adopted seamless learning for science for a school year.A 10 factors instrument based on the different facets of seamless learning was created.Exploratory factor analysis however generated only six factors.The first four factors pertaining to their seamless learning practices are self-directed and collaborative learning with mobile computing devices,constructive learning,ubiquitous learning,and higher order epistemic work.In addition,the other two motivational related factors include intrinsic motivation and mobile-based learning self-efficacy.Relationships among these factors are investigated through correlation and regression analyses.All factors are significantly correlated.The regressions indicates that while the students were intrinsically motivated to learn science,only learning practices that engage students in ubiquitous learning and higher order epistemic work predict their intrinsic motivation.However,all four seamless learning practice factors are significant predictors of the students' self-efficacy in mobile-based learning.