Vol. 10, No. 1, 2024, pp. 87-94 DOI: https://doi.org/10.29210/020242384 Contents lists available at Journal IICET JPPI (Jurnal Penelitian Pendidikan Indonesia) ISSN: 2502-8103 (Print) ISSN: 2477-8524 (Electronic) Journal homepage: https://jurnal.iicet.org/index.php/jppi 87 Validity and reliability tests on generalized anxiety disorder diagnostic scale Valensia Putri Adhyartasari *) , Christiana Hari Soetjiningsih, Susana Prapunoto Psychology Faculty, Universitas Kristen Satya Wacana, Jl. Diponegoro No.52-60, Salatiga, Kec. Sidorejo, Kota Salatiga, Jawa Tengah 50711, Indoneia Article Info ABSTRACT Article history: Received Des 08 th , 2022 Revised Mar 29 th , 2023 Accepted Jan 21 st , 2024 Generalized anxiety disorder is one of the most common anxiety disorders in society. The purpose of this study is to develop a diagnostic scale for generalized anxiety disorder because there is no self-report diagnostic tool for generalized anxiety disorder based on DSM-V and ICD-10 criteria in Indonesia. The research uses quantitative research. Respondents in the field test consisted of 210 adult respondents aged 18-65 years, moderate or had experienced anxiety, and were Indonesian citizens. This study provides the results that the overall anxiety disorder diagnostic scale has gone through the internal validity and internal reliability test stages and obtained valid and reliable results so that this measuring instrument has described the suitability of the measuring instrument construct with the data. Based on testing the average processing time of 6 respondents, it was obtained an average of approximately 5 minutes (2 minutes 4 seconds to 5 minutes 21 seconds). Scoring for each item that supports or is in accordance with the symptoms (favorable), namely Yes = 1 and No = 0. The scoring for each item that does not support the symptoms is Yes = 0 and No = 1. This measuring instrument is declared to have good validity and reliability. Keyword: Construct validity, Diagnostic scale, Generalized anxiety disorder, EFA, CFA © 2024 The Authors. Published by IICET. This is an open access article under the CC BY-NC-SA license (https://creativecommons.org/licenses/by-nc-sa/4.0) Corresponding Author: Valensia Putri Adhyartasari Universitas Kristen Satya Wacana, Email: 832021801@student.uksw.edu Introduction Generalized anxiety disorder is one of the most common anxiety disorders (Barlow et al., 2016; Munir & Takov, 2021). Singapore as one of the countries in Southeast Asia has a percentage rate of 1.6% from 2010-2016 for generalized anxiety disorder (Statista Research Department, 2019). In addition, it is recorded that 6.8 million adults in America experience a generalized anxiety disorder (Anxiety and Depression Association of America, 2020). The percentage for generalized anxiety disorder in Indonesia does not clearly written, however, anxiety disorders are the second most common disorder experienced by Indonesian people (PDSKJI, 2020). The Indonesian Health Research and Development Agency states that 6.8% of the population experiencing anxiety disorders out of 2800 samples of the Indonesian population, while the PDSKJI data (2020) shows that 65% of the 4010 samples of the Indonesian population experience anxiety disorders. Research conducted by Bruce et al in Olthuis et al.(2016) said that individuals who experience generalized anxiety disorder and 12 years after experiencing the first episode of GAD, only 58% will have the opportunity to experience a full recovery, but 47% who have experienced recovery are likely to experience relapse. return. In addition, someone who has a generalized anxiety disorder can experience other comorbidities such as