Silvia Agustin, Pakhrur Razi
Human resources with a high level of thinking abilities, such as critical thinking, creativity, communication, teamwork, independence, cross-cultural understanding, and ICT literacy, are needed for the growth of the 21st century. However, cultivating a high level of thinking abilities is still insufficient and does not fulfill the necessities of the 21st century. An e-book based on problem-based learning and oriented toward higher-order thinking skills is developed as a result of this research. Measurement of the e-book's validity is the aim of this study. This research used a descriptive methodology and a questionnaire for collecting data. The questionnaire instrument is a validation sheet with four e-book validation criteria consisting of several indicators. E-book validation has shown valid findings with an average of 0.87 valid categories. The results of the research show that the product can be used as a learning resource for students and teachers to achieve learning goals and meet the demands of the 21st century. © Published under licence by IOP Publishing Ltd.
Physics Department, Universitas Negeri Padang, West Sumatra, 25131, Indonesia; Research Center of Disaster Monitoring and Earth Observation, Universitas Negeri Padang, West Sumatra, 25131, Indonesia
