This study reports on the development and application of a four-tier multiplechoice (4TMC) diagnostic instrument, which has not been reported in the literature. It is an enhanced version of the two-tier multiple-choice (2TMC) test. As in 2TMC tests, its answer and reason tiers measure students' content knowledge and explanatory knowledge, respectively. The two additional tiers measure the level of confidence of students in the correctness of their chosen options for the answer and reason tiers respectively. The 4TMC diagnostic test focused on the properties and propagation of mechanical waves. It was administered to 598 upper secondary students after they were formally instructed on the foregoing topics. The vast majority of the respondents were found to have an inadequate grasp of the topics tested. Mean scores and mean confidence associated with the answer tier was higher than those associated with the reason tier. The students tended to be poorly discriminating between what they know and what they do not know. Familiarity with the topic tested was associated with greater percentage of students giving correct answers, higher confidence, and better discrimination quotient. Nine genuine alternative conceptions (which were expressed with moderate levels of confidence by students) were identified.In the past two decades, a plethora of studies have focused on the identification and modification of conceptions that differ from established scientific knowledge, which are commonly labelled as alternative conceptions (ACs). In investigating students' ACs, multiple-choice questions (MCQs) tend to be a popular choice. Typical MCQs require students to choose the best answer to a given question from a given set of alternatives. MCQs

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The attitudes towards science of upper‐primary students in three ability strands (average, above average, and gifted) were investigated. A total of 580 upper primary students from co‐educational government and government‐aided schools in Singapore were involved in this study. The attitude subscales investigated were enjoyment of science, preference for science careers, and appreciation of the social implications of science. Gender and ability were found to have statistically significant effects on the variations in the mean score for each attitude subscale. Boys, in general, had more positive views about science than girls. Overall, above‐average and gifted students had comparable attitudes towards science; both of them consistently showed more positive attitudes than average ability students. At least 18% of the sample, with greater percentage being boys, reported “not sure” responses in 50% or more of the total attitude items. © 2008 Wiley Periodicals, Inc. J Res Sci Teach 45: 940–954, 2008