which requires the application of different subsets of testing methods. Questionnaire testing is an iterative process. However, there are numerous problems in questions, which can be identified only by pretesting the questions. Nowadays, most of the researchers are of the view that if they easily get the answers to their questions in the questionnaire or if the questions used in their research are taken from some other research, there is little need to pre-test them. This article also reflects on the nature of CT as a construct. Thus, this study provides a tool to evaluate adults’ CT: the Algorithmic Thinking Test for Adults (ATTA), which was developed according to psychometric standards. Further analyzing the psychometric quality of the 27 items, 20 of them with excellent reliability indices were selected for the test. After a series of confirmatory factor analyses, a unidimensional model that represents algorithmic thinking was adopted. Next, the items were piloted on a sample of 289 participants, 137 experts in CT, and 152 novices. ![]() Then, in order to provide validity evidence based on the test content, a team of 11 subject-matter experts coded the initial pool of items using two different systems of categories based on CT components and contents. The team designed a set of items and explored a subset of those through two qualitative pilots. This study describes the development and validation process of a computational thinking (CT) test for adults.
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