The purpose of this instrumental study was to show how to conduct a study aimed at obtaining content validity evidence in the test construction/adaptation process. An applied perspective was used, and this paper presents the content validity analysis of the Spanish adaptation of the State-Trait Cheerfulness Inventory trait form (STCI-T). This paper illustrates the stages required to analyze content validity: 1) definition of the content domain to be assessed, 2) item construction, and 3) expert

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... judgment of the items constructed. This study focused mainly on the third stage and the results obtained with a previously selected panel of experts are included. The paper briefly describes the most important criteria to consider in the selection of experts, the procedure recommended to obtain judgments, the material to administer, aspects of items to assess, and the type of analyses that should be conducted. Based on the results obtained for the Spanish adaptation of the STCI-T, the article discusses the importance of obtaining content validity evidence in the test construction/adaptation process. The indices used demonstrated good content validity for the Spanish version of the STCI-T. ABSTRACT. The purpose of this instrumental study was to show how to conduct a study aimed at obtaining content validity evidence in the test construction/adaptation process. An applied perspective was used, and this paper presents the content validity analysis of the Spanish adaptation of the State-Trait Cheerfulness Inventory trait form (STCI-T). This paper illustrates the stages required to analyze content validity: 1) definition of the content domain to be assessed, 2) item construction, and 3) expert judgment of the items constructed. This study focused mainly on the third stage and the results obtained with a previously selected panel of experts are included. The paper briefly describes the most important criteria to consider in the selection of experts, the procedure recommended to obtain judgments, the material to administer, aspects of items to assess, and the type of analyses that should be conducted. Based on the results obtained for the Spanish adaptation of the STCI-T, the article discusses the importance of obtaining content validity evidence in the test construction/adaptation process. The indices used demonstrated good content validity for the Spanish version of the STCI-T.