Penelitian ini bertujuan untuk (1) Mendeskripsikan hasil kelayakan dari pengembangan LKPD berbasis Problem Based Learning (2) Mendeskripsikan efektifitas yang dicapai siswa terhadap proses pembelajaran menggunakan LKPD berbasis Problem Based Learning (3) Mendeskripsikan respon siswa terhadap pengembangan LKPD yang berbasis Problem Based Learning. Penelitian pengembangan ini menggunakan model 4-D dari Thiagarajan, Semmel, dan Semmel yang terdiri dari tahap define, design, development, disseminate. Dalam Penelitian ini subyek yang digunakan adalah kelas X IIS 5 MAN Sidoarjo. Instrumen yang digunakan dalam penelitian ini  adalah perhitungan nilai pretest-posttest untuk mengetahui peningkatan hasil belajar, angket respon siswa untuk mengetahui tanggapan dari peseta didik dan lembar telaah dan validasi dari para ahli untuk mengetahui kelayakan LKPD.

Berdasarkan penelitian yang dilakukan LKPD berbasis problem based learning ini menunjukkan bahwa (1) hasil validasi dari ahli materi mendapatkan presentase sebesar 87,5% yang dikategorikan “sangat layak”, sedangkan dari hasil validasi grafik mendapatkan presentase 92,6% yang dikategorikan “sangat layak” dan dari hasil validasi Bahasa mendapatkan presentase 80% yang dikategorikan “layak” (2) Pada peningkatan hasil belajar yang dicapai melalui perhitungan ketuntasan klasikal dari 6% naik menjadi 88%. Selain perhitungan ketuntasan klasikal, hasil belajar yang dihitung melalui n-gain score sebesar 0,7 dengan kategori “tinggi”.  (3) Berdasarkan angket respon siswa yang sudah diberikan menunjukkan presentase sebesar 82,3% yang dikategorikan “sangat layak”.

Kata Kunci                   : LKPD, Problem Based Learning, Hasil Belajar, Respon Siswa.

The aims of this research is are (1) Describe the feasibility of developing LKPD based on Problem Based Learning (2) Describe the effectiveness achieved by students towards the learning process using LKPD based on Problem Based Learning (3) Describe students’ response to the development of LKPD based on Problem Based Learning. This development research uses a 4-D model from Thiagarajan, Semmel, and Semmel which consists of define, design, development, disseminate. In this research the subjects were 33 students in X IIS 5 MAN Sidoarjo. The instruments used in this study were the calculation of the value of the pretest-posttest to find out the improvement in learning outcomes, student response questionnaires to determine response from students , review sheets, and validation from experts to determine the feasibility of the LKPD.

Based on the research showed that (1) the results of the validation of the material experts get a percentage of 87.5% which is categorized as "very feasible", while the results of graph validation get a percentage of 92.6% which is categorized as "very feasible", and from the results of Language validation get a percentage of 80% which is categorized as "feasible". (2) On improving learning outcomes achieved through classical completeness calculations from 6% up to 88%. In addition to classical completeness calculations, learning outcomes are calculated through the n-gain score of 0.7 in the "high" category. (3) Based on the students’ response quistionare who have been given show a percentage of 82.3% which is categorized as "very feasible".

Keywords              : Student’s Worksheet, Problem Based Learning, Learning Outcomes, Student Response.