Penelitian ini bertujuan untuk mengetahui pengaruh penerapan metode demonstrasi terhadap keterampilan proses sains anak melalui kegiatan tenggelam terapung dan perubahan wujud zat pada air. Penelitian ini menggunakan pendekatan kuantitatif dengan menggunakan desain penelitian Pre-eksperimental Design (nondesigns) jenis One-group Pre-test Post-test Design. Subjek penelitian ini adalah anak usia 4-5 tahun di TK ABA Klepek Sukosewu Bojonegoro dan terdiri dari 19 anak. Teknik pengumpulan data melalui observasi dan dokumentasi. Dengan menggunakan analisis data uji jenjang bertanda Wilcoxon Matched Pairs. Hasil analisis data berupa statistik nonparametris uji Liliefors dengan data hasil penilaian pretest dan posttest. Hasil penelitian diperoleh pada saat pretest terdapat 6 anak masuk pada kriteria belum berkembang, 11 anak masuk kriteria mulai berkembang, dan 2 anak berkembang sesuai harapan. Penilaian posttest setelah melakukan treatment diperoleh 1 anak pada kriteria masih berkembang, 6 anak masuk kriteria berkembang sesuai harapan, dan 12 anak berkembang sangat baik. Hasil perhitungan dengan menggunakan uji Liliefors diperoleh nilai Thitung sebesar 0,2121 dan nilai Ttabel 0,195. Maka dapat disimpulkan bahwa Thitung > Ttabel (0,2121 > 0,195) sehingga H0 ditolak dan Ha diterima yang berarti terdapat pengaruh yang signifikan antara metode demonstrasi terhadap keterampilan proses sains anak. Kata Kunci: Metode Demonstrasi, Keterampilan Proses Sains, Anak Usia Dini.

This study aims to determine the effect of the implementation of demonstration methods on children's science process skills by means of floating drowning activities and changes in the from of substances in water. Pre-eksperimental Design (nondesigns) type design of One-group Pre-test Post-test Design. The subjects of this study are children aged 4-5 years in Kindergarten ABA Klepek Sukosewu Bojonegoro and consists of 19 children. Data collection techniques through observation and documentation. By using the analysis of test data ladder marked Wilcoxon MatchedPairs. The result of data analysis is nonparametric statistic of Liliefors test with pretest andposttest.valuation data. The result of the research was obtained at the time of pretest, there were 6 children entered on the criteria not yet developed, 11 children entered criteria started to develop, and 2 children developed as expected. The posttest assessment after treatment obtained 1 child on criteria is still developing, 6 children entered the criteria developed as expected, and 12 children developed very well. Result of calculation by using Liliefors test obtained by value of Thitung equal to 0,2121 and value Ttabel 0,195. Then it can be concluded that Thitung> Ttabel (0,2121> 0,195) so that H0 rejected and Ha accepted which mean there is significant influence between demonstration method to skill of child science process. Keywords: Demonstration Method, Skills Process of Science, Early Childhood.

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