Keterampilan proses sains siswa untuk setiap siklusnya mengalami peningkatan. Hal ini dilihat dari ketuntasan klasikal untuk Siklus I sebesar 36,67%, Siklus II sebesar 90,00%, dan Siklus III sebesar 96,67% telah mempunyai keterampilan proses sains yang baik. Keterampilan sosial siswa dari.

The purpose of this study is to improve science process skill (SPS) mastery of tenth graders using guided inquiry. Research design is classroom action research. Data taken by direct observation and analyzing the students' worksheet.

Student worksheets analyzed by comparing to the SPS indicator from Harlen and Rustaman. Data analysis using descriptive method. It can be concluded that 1) application of guided inquiry can improve the students’ skill mastery. 2) Students will felt uncomfortable when moved from traditional learning class to guided inquiry without prior adaptation, impeding learning process, lowering students' perform and achievement. 3) Inquiry should be applied gradually, based on the condition and situation of the students, particularly when students used to traditional teaching.

This research is a quasi experimental research and design used is ARandomized Pretes-Postest Control Group Design. The subject of the researchdetermined by random toward experimental and control groups. The results of this studyshowed that there was differences class between implements the inquiry learning andconventional learning. Game ps2 winning eleven untuk pc. Mean score N-Gain science of process skills students washighest in primary schools reached 0.29 A, while for the N-Gain lowest in primaryschools C of 0.15 As for the indicators of science-process skills, process skills of thehighest indicators in the experimental class there is the aspect of the hypothesis, whilethe lowest indicator contained in the aspect of the question. In the control class there areindicators that contained by aspects of the hypothesis while the lowest was on aspects ofobservation. The results visible experimental class science process skills results showedhigher levels of N-gain control of the class.

The results in the experimental classsignificantly more improve students’ science process skills than conventional class. Keywords: Science Process Skills, Learning Science.