M.A. Ridwan, Armiati
The aims of this research was to produce the learning devices based ona valid Problembased learning (PBL) to improve the students' problemsolving ability They are lesson plan and students' worksheet. for grade VII SMP. PBL aims to involve students in solving problems using real-world problems as a context for students to learn through problem solving ability. Learning devices using a PLOMP Model consist of three stages: The preliminary investigation phase, the development phase and the evaluation phase. Learning devices are said to be valid if they meet the validity of content and construction. The result of research known that instrument used is a validation sheet containing the presentation aspects, content worthiness and material, graphic and language. Expert validation results show that learning devices meet valid criteria. © 2020 Published under licence by IOP Publishing Ltd.
Mathematics Department, Universitas Negeri Padang, Padang, Indonesia
