Penelitian ini bertujuan menghasilkan LKPD yang berorientasi guided discovery untuk melatihkan keterampilan berpikir kritis materi ikatan kimia kelas X SMA. Rancangan penelitian menggunakan RnD dengan tahapan persiapan, pra-penelitian, studi lapangan, studi literatur, rancangan pengembangan LKPD, rancangan produk, pengembangan LKPD, dan uji coba produk. Validitas LKPD dilakukan oleh tiga validator yang kelayakannya ditinjau dari validitas, efektifitas dan kepraktisan. Berdasarkan hasil penelitian dapat disimpulkan bahwa (1) validitas Pada LKPD 1 berdasarkan kriteria isi mendapatkan persentase validitas 81,33%, kriteria bahasa 78,33%, kriteria penyajian 80%, dan kriteria kegrafisan sebesar 78,66%. Pada LKPD 2 berdasarkan kriteria isi mendapatkan persentase validitas 81,33%, kriteria bahasa 78,33%, kriteria penyajian 80%, dan kriteria kegrafisan sebesar 78,66%. Pada LKPD 3 berdasrkan kriteria isi mendapatkan persentase validitas 81,33%, kriteria bahasa 78,33%, kriteria penyajian 80%, dan kriteria kegrafisan sebesar 78,66%. (2) ketuntasan hasil belajar mendapatkan persentase 80% dan lebih dari 75% setiap komponen KBK dalam kategori sedang-tinggi.(3) kepraktisan mendapatkan persentase masing-masing aspek sebesar ≥61% . sehingga LKPD yang dikembangkan dikatakan layak untuk digunakan.

Kata kunci: guided discovery, ketuntasan hasil belajar, KBK, LKPD. 

The aims of this research are produce guided discovery-oriented worksheet to train critical thinking skills in chemical bonding materials in class X SMA. The research design uses Research and Develompent with the stages of preparation, pre-research, field studies, literature studies, worksheet development plans, product designs, worksheet development, and product trials. The validity of worksheet is carried out by three validators whose eligibility is evaluated in terms of validity, effectiveness, and practicality. Based on the results of the study it can be concluded that (1) the validity of worksheet 1 based on the content criteria gets a validity percentage of 81.33%, language criteria 78.33%, 80% presentation criteria, and the criteria of graphics is 78.66%. In worksheet 2, based on the content criteria, the validity percentage was 81.33%, the language criteria was 78.33%, the presentation criteria was 80%, and the criteria for graphics were 78.66%. In worksheet 3 based on content criteria, the percentage of validity was 81.33%, the language criteria was 78.33%, the presentation criteria was 80%, and the criteria for graphics were 78.66%. (2) completeness of learning outcomes get a percentage of 80% and more than 75% of each crytical thinking skill component in the medium-high category, (3) practicality gets a percentage of each aspect of ≥61%. so the developed worksheet is said to be feasible to use.

Key words: guided discovery,critical thinking skill, completeness of learning outcomes, worksheet.