Developing big-book literacy media as reading learning media for first graders

This research develops big-book literacy media and analyze the media reliability. The method was research and development, using Thiagarajan’s model design, i.e., the 4-D model. This model was composed of four phases, namely Define, Design, Develop, and Disseminate. The developed big-book literacy media was given a reliability percentage of 100% by media experts. The media, accordingly, was categorized as very reliable. It was given a reliability percentage of 92% by language experts, and as such, was considered very reliable as well. Practitioners/users gave a reliability percentage of 98%, classifying the media as very reliable. By accumulating the reliability percentages given by media experts, language experts, and practitioners/users, we could infer that the developed media had a mean reliability percentage of 96.7%, predicating it as a very reliable one. Based on the results of validation and school test, we could declare that the developed big-book literacy media was very reliable to use in a learning process at elementary schools. Grounded on the test using two data collection techniques, which were observation and interviews with teachers and students as users in this test, we could sum up that the developed big-book literacy media was reliable to use in a learning process.