Silvi Elvionita, Ahmad Fauzi, Ratnawulan
The evaluation of the validity of textbook is important to determine whether a textbook has a proper quality. This study sought to evaluate the validity of the textbook on the aspects of content, presentation style, language and face using a valid questionnaire which was developed based on Likert scale. The validity of the textbook was assessed by three educational experts and practitioners. The data was later analyzed to determine the value of V of Aiken. The V of Aiken value of experts and practitioners on the aspect of content is 0,81 and 1, on the aspect of textbook presentation style is 0,81 and 0,94, on the aspect of language is 0,88 and 0,92, on the aspect of face is 0,89 and 1. The value of V showed that the content, presentation style, language and face of the textbook is categorized as valid. This means the textbook has satisfied most of its standard quality criteria. © 2019 Published under licence by IOP Publishing Ltd.
Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang, Jl Prof Hamka, Padang, 25131, Indonesia
