Abstrak: This research aims to describe the prediction and communication skill on acid-base material through application problem solving model to the cognitive students group with high, medium, and low category. This research used pre-experiment method with One Shot Case Study Design. The Subject in this research was class XI_science4 students of MAN 1 Bandar Lampungt academic year 2012-2013. The data analysis used descriptive analysis. The result showed: (1)Predic-tion skill, almost half students have excellent criteria and most students have good in high category; almost half students have good criteria, the rest of students have excellent, average, and poor in medium category; most students have good cri-teria, the rest of students have excellent, average, and poor in low category. (2)communication skill, all students have excellent criteria in high category; almost all students have excellent criteria, the rest of students have good in me-dium and low category. The high category have predictin and communication skill more high than medium and low category.
Kata Kunci: problem solving, prediksi, komunikasi, kelompok tinggi, kelompok sedang, kelompok rendah