Tujuan penelitian ini adalah (1) mendeskripsikan langkah-langkah penggunaan model kooperatif tipe Group Investigation dengan multimedia dalam meningkatkan sikap ilmiah dan hasil belajar IPA tentang proses pembentukan tanah, (2) meningkatkan sikap ilmiah siswa melalui penggunaan model kooperatif tipe Group Investigation dengan multimedia, (3) meningkatkan hasil belajar IPA tentang proses pembentukan tanah melalui penggunaan model kooperatif tipe Group Investigation dengan multimedia dan (4) mendeskripsikan kendala dan solusi penggunaan model kooperatif tipe Group Investigation dengan multimedia dalam meningkatkan sikap ilmiah dan hasil belajar IPA tentang proses pembentukan tanah di kelas V SDN Tanuharjo Tahun Ajaran 2014/2015.
Penelitian ini merupakan penelitian tindakan kelas kolaboratif. Penelitian dilaksanakan dalam tiga siklus, setiap siklus terdiri dari perencanaan, pelaksanaan, observasi, dan refleksi. Subjek penelitian ini berjumlah 28 siswa. Data berasal dari siswa, guru, teman sejawat, dan peneliti. Teknik pengumpulan data adalah tes, wawancara dan observasi. Validitas data menggunakan triangulasi teknik dan triangulasi sumber. Analisis data dilakukan melalui analisis statistik deskriptif komparatif dan kualitatif.  
Hasil penelitian menunjukkan bahwa (1) penerapan model pembelajaran kooperatif tipe Group Investigation dengan multimedia dilaksanakan dengan langkah-langkah: (a) seleksi topik; (b) perencanaan kerjasama; (c) implementasi; (d) analisis dan sintesis; (e) penyajian hasil akhir; dan (f) evaluasi. (2) penerapan model kooperatif tipe Group Investigation dengan multimedia dapat meningkatkan sikap ilmiah dan hasil belajar IPA di kelas V SDN Tanuharjo tahun ajaran 2014/2015. Peningkatan sikap ilmiah dari 68,51% pada siklus I menjadi 77,05% pada siklus II, dan meningkat lagi menjadi 85,71 pada siklus III. Sedangkan peningkatan hasil belajar IPA dari pretest 25,00% meningkat menjadi 83,65% pada siklus I, 89,30% pada siklus II, dan 94,65% pada siklus III; dan (3) kendala dalam penelitian ini adalah pelaksanaan percobaan dan diskusi berjalan kurang efektif dan kurangnya percaya diri siswa pada saat melakukan presentasi. Solusi yang dilakukan yaitu siswa diberi arahan dan batasan waktu yang jelas pada saat melakukan percobaan atau diskusi, dan siswa diberi motivasi agar percaya diri dan dibiasakan untuk melakukan presentasi dengan cara guru menciptakan pembelajaran inovatif lainnya khususnya pembelajaran kooperatif yang dapat membiasakan siswa untuk melakukan presentasi.
Simpulan penelitian ini adalah penggunaan model kooperatif tipe Group Investigation dengan multimedia dapat meningkatkan sikap ilmiah dan hasil belajar IPA di kelas V SDN Tanuharjo Tahun Ajaran 2014/2015.

Kata kunci: Group Investigation, Multimedia, Sikap Ilmiah

The aims of this research are (1) to describe the application of Group Investigation cooperative learning model using multimedia in improving scientific attitudes and learning outcomes of natural science, (2 ) to improve scientific attitudes using Group Investigation cooperative learning model using multimedia, (3) to improve learning outcomes of natural science about the process of soil formation using Group Investigation cooperative learning model using multimedia , and (4) to find out problems and solutions on the application of Group Investigation cooperative learning model using multimedia in improving scientific attitudes and learning outcomes of natural science about the process of soil formation for the fifth grade students of SDN Tanuharjo in the academic year of 2014/2015.
This research is a collaborative Classroom Action Research (CAR). It was conducted in three cycles consisting of planning, action, observation, and reflection on each cycle. Subject of this research were 28 students. Source of data were obtained from students, teachers, colleagues, and researchers. The techniques of collecting data were test, interview, and observation. Validity of data was obtained by using triangulation of techniques and source involving observers, teachers, and students. Data were analyzed using descriptive comparative analysis and qualitative.
The results of research showed that (1) the application of Group Investigation cooperative learning model using multimedia can be implemented through the following steps: (a) the selection of topics; (b) planning cooperation; (c) implementation; (d) analysis and synthesis; (e) the presentation of the final results; and (f) evaluation. (2) the application of Group Investigation cooperative learning model using multimedia can improve scientific attitudes and natural science learning for the fifth grade students of SDN Tanuharjo in the academic year of 2014/2015. The increase on scientific attitudes from 68.51% in the first cycle, 77.05% in the second cycle, and increased by 85.71% in the third cycle. Meanwhile, the increase of the natural science learning outcomes from pretest 25.00%, increased by 83.65% in the first cycle, 89.30% in the second cycle, and 94.65% in the third cycle; and (3) the problems faced in this research namely implementation of experiments and discussions was not effective and the lack of confidence of students at the time of presentation. The solution is students are given guidance and a clear time limit at the time of trial or discussion, and students are given motivation to be confidence and familiarized to make presentation by the teacher create other innovative learning especially cooperative learning which familiarize students to make presentations.

The conclusion of this research is the application of Group Investigation cooperative learning model using multimedia in improving scientific attitudes and learning outcomes of natural science for the fifth grade of SDN Tanuharjo in the academy year of 2014/2015.
 
Keywords: Group Investigation, multimedia, scientific attitudes