This study aims to determine the implementation of the learning problem-solving laboratory model and improvement of critical thinking skills of students on temperature and heat topic. The method used in this research was pre-experiment, with one-group pretest-posttest design. The population of this study was class X SMA Muhammadiyah 1 Garut. The sample was selected by random sampling technique, with a sample of one class X-2, amounting to 30 people. The implementation of problem-solving laboratory model learning was observed by observers with observation sheets and improvement of students' critical thinking skills measured by essay tests. The results showed that the average implementation of problem-solving laboratory model learning for teacher activities was 84% and student activities at 80% were both categorized well. There was an increase in the critical thinking skills of students shown by the average of the normalized gain value of 0.64 include the medium category. Thus, the problem-solving laboratory model learning can be used as an alternative in improving students' critical thinking skills on the topic of temperature and heat.
Ikan nila merupakan ikan air tawar yang memiliki nilai ekonomis tinggi dan telah banyak dibudidayakan di berbagai daerah salah satunya di Kabupaten Musi Rawas. Perkembangan budidaya perikanan khususnya ikan nila di Kabupaten Musi Rawas terus mengalami peningkatan. Kegagalan panen merupakan permasalahan yang mengancam keberlangsungan produksi perikanan. Penelitian ini bertujuan mengidentifikasi faktor-faktor yang mempengaruhi kegagalan panen pada budidaya ikan nila di Kabupaten Musi Rawas dan untuk membangun model dinamis strategi pencegahan kegagalan panen pada budidaya ikan nila di Kabupaten Musi Rawas. Penelitian ini menggunakan metode purposive sampling dengan pertimbangan teknik snowball. Metode ini diterapkan dalam pengambilan data kuesioner terhadap responden dimana kriteria responden yang dipilih yakni masyarakat yang memiliki budidaya ikan nila di Kecamatan Tugumulyo. Hasil penelitian menunjukkan sebanyak 75% petani ikan nila di Kecamatan Tugumulyo pernah mengalami kegagalan panen. Adapun penyebabnya seperti adanya bencana banjir, kenaikan harga pakan dan serangan penyakit. Adanya bimbingan dari pemerintah maupun penyuluh perikanan setempat mengenaipengendalian penyakit dan penggunaan pakan alami sebagai alternatif atau pakan tambahan sehingga mampu meminimalisisr resiko kegagalan panen akibat kenaikan harga pakan.
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