Developing science process skills in novice learners is not an easy task for teachers although these skills are essentially needed to solve problems and make decisions in real-life situation. This research is pre-test post-test control group design. Pre-test and post-test were administered to the students in the beginning and the end of the approach to measure n-gain of students' science process skills. Students' activities in the classroom were also recorded and analysed descriptively and students' responses concerning the approach were recorded by a questionnaire given at the end of the session. Guided discovery problem-posing appeared helpful to most students for improving both basic and integrated science process skills, specifically higher order thinking skills. Students further recognized that using guided discovery problem-posing made the topics learned become easier and more entertaining.