The conceptual understanding of Archimedes’ principle can be verified in experimental procedures which determine mass and density using a floating object. This is demonstrated by simple experiments using graduated beakers.

Active learning, represented by inquiry-based science education (IBSE) strategies, is considered essential for students to develop skills and knowledge to prepare for the challenges of the 21st century world. The success of IBSE, and the resulting development of inquiry skills in particular, can be enhanced by various factors. This study is focused on the synergetic effect of the implementation of IBSE through well-designed inquiry activities across STEM-related disciplines, enhanced by digital technologies and formative assessment tools, delivered by teachers educated in this field. The corresponding research based on a quasi-experimental design evaluated the effect on the development of inquiry skills that were identified before and after a period of consistent implementation of IBSE, using a written test of inquiry skills as the main research instrument. The research findings on the sample of 2307 upper secondary school students confirmed a low initial level of inquiry skills, however a statistically significant improvement in students’ inquiry skills with medium size effect was identified. The detailed analysis shows the largest impact in the skill of determination of accuracy and statistically significant differences between genders without practical importance, however no difference was identified with regard to the number of inquiry activities undertaken.

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The current initiatives at European level urge more emphasis on the implementation of inquiry-based science education (IBSE). Although there are existing studies on the effect of IBSE on understanding science, fewer attempts have been made regarding the development of various inquiry skills. In this research, a model of consistent implementation of inquiry activities across the three subjects of mathematics, physics and informatics was developed and its efficacy with regard to selected inquiry skills development was examined. In order to evaluate the efficacy, a test assessing the level of inquiry skills development was designed. This test was taken by 300 high school students both before and after experimental teaching. In between students were exposed to coherent and intentional multidisciplinary inquiry-based learning within a period of approx. four months. The results showed a statistically significant increase on test scores that is gender independent, however the class specialization played a significant role. The results indicate that the designed model of coactive IBSE implementation is efficacious for inquiry skills development and therefore applicable in school practice. Key words: inquiry skills assessment, inquiry-based science education, inquiry skills, test of inquiry skills.