<![CDATA[This study was motivated by teachers difficulties in applying portfolio assessment, because the learning so far used the paper assessment and pencil test. This study aimed to develop a feasible, valid and reabel portfolio assessment instrument. The type of study was Research and Development (R D). The population was teachers and students of class VI Gedongtataan. Sampling was done by cluster sampling technique of 5 teachers and 102 students. Data collection using questionnaires and observation sheets. Place of study was at Elementary School 38, 12, and 6 in Gedongtataan. Data analysis used Product Moment and Kohen Kappa test. The result of study showed the achievement of a decent, valid and reabel portfolio assessment instrument with Kappa value of 0.638 and a significant value of 0,000 indicated good correlation of reability.Penelitian ini dilatarbelakangi adanya kesulitan guru dalam menerapkan assesmen portofolio, karena pembelajaran selama ini menggunakan assesmen paper and pencil test. Penelitian ini bertujuan menggembangkan instrumen assesmen portofolio yang layak, valid, dan reabel. Jenis penelitian Research and Development (RD). Populasi dalam penelitian ini adalah guru dan siswa kelas VI Gedongtataan. Pengambilan sampel dilakukan dengan teknik cluster sampling sebanyak 5 guru dan 102 siswa. Pengumpulan data menggunakan lembar angket dan lembar observasi.Tempat penelitian di SDN 38, SDN 12, dan SDN 6 Gedongtataan. Analisis data menggunakan product moment dan uji Kohen Kappa. Hasil penelitian menunjukkan terwujudnya instrumen asesmen portofolio yang layak, valid, dan reabel dengan nilai Kappa 0,638 dan nilai Signifikan 0,000 menandakan adanya korelasi reabilitas yang baik.Kata Kunci : assesmen, portofolio, pembelajaran tematik]]>
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