Tujuan penelitian pengembangan ini adalah untuk mengetahui pengembangan Lembar Kerja siswa (LKS) berbasis unjuk kerja pada mata pelajaran IPA materi sifat dan perubahan wujud benda yang valid dan efektif. Pengembangan Lembar Kerja Siswa (LKS) berbasis unjuk kerja dengan subjek uji coba pada SDN Banjar Kemantren 1 Buduran-Sidoarjo kelas IV. Langkah-langkah pengembangan yang digunakan adalah sebagai berikut: (1) analisis ujung depan (2) analisis siswa ,(3) analisis konsep, (4) analisis tugas, (5) spesifikasi tujuan pembelajaran, (6) pemilihan format, (7) penyusunan LKS (8) Rencana awal, (9) validasi ahli, (10) uji coba perorangan ,(11) uji coba kelompok kecil, (12) uji coba kelompok besar. Hasil yang diperoleh dari para ahli adalah sebagai berikut: Ahli materi yaitu 70%, ahli media 83,5%, ahli pembelajaran 86%, dan guru kelas 86%. Hasil angket tanggapan siswa pada uji coba perorangan mendapat rata-rata 100%, uji coba kelompok kecil 97%, dan uji coba kelompok besar 96%. Berdasarkan hasil pengembangan Lembar Kerja Siswa (LKS) berbasis unjuk kerja dinyatakan valid atau layak dan efektif digunakan dalam pembelajaran oleh siswa kelas IV sekolah dasar. Kata Kunci: Pengembangan, Lembar Kerja Siswa, Unjuk Kerja

The aim of this development study is to know the development of students worksheet (LKS) based on performance which is valid and effective in Science subject in the material of the nature and form change of objects. This is The Development of Students Worksheet based on performance with the subjects of the test are students in class IV of SDN Banjar Kemantren 1 Buduran-Sidoarjo. Development steps that used are as follows: (1) front end analysis (2) analysis of the students, (3) analysis of the concept, (4) analysis of the task, (5) specification of learning objectives, (6) selection of format, (7) preparation of students worksheet, (8) Initial plan, (9) validation of the experts, (10) individual test, (11) small group test, (12) large group test. The results that obtained from the experts are as follows: Material expert is 70%, media expert is 83,5%, learning expert is 81,5%, and classroom teacher is 86%. The results of students’ response questionnaire in individual test get an average of 100%, small group test is 97%, and large group test is 96%. Based on the results, the development of Students Worksheet (LKS) based on performance is declared as valid or feasible and effective in teaching learning process conducted by students in class IV of elementary school. Keywords: Development, Students Worksheet, Performance

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