Diseño y validación de una prueba objetiva para evaluar competencias específicas en ciencias naturales de educación primaria.

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Abstract
The aim of this article is to describe the design and validation of an objective test about ecosystems within the primary school natural science and environmental education curriculum. The test follows the evidence-centred design and structure of the Icfes assessment model (2018, 2019). The sample for the study comprised 133 students from public schools in Colombia, aged between 7 and 11 years. The test was validated by a panel of experts and an analysis of its difficulty and discrimination indices. Test reliability was assessed by calculating the biserial correlation and KR-20 coefficients. The results showed indices of difficulty and discrimination in keeping with Backhoff et al. (2000) and Ortiz et al. (2015). Reliability was also found to be acceptable at 0.74. The study findings show that the results of the test are appropriate, the quality is sufficient, and the test assesses the natural science skills of inquiry, explanation and comprehensive use of scientific knowledge.

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