The study was conducted to develop science module based on project-based learning that is feasible to be implemented in science learning and has potency to build critical thinking skills of junior high school students. The study was Research and Development (RD), modified from Borg Gall steps covering only research and information collecting, planning, preliminary form of product development, expert judgment, product revision, and final product. The subjects were 2 expert lecturers (content expert and media expert) and 2 science teachers of SMP N 1 Wonosari. The types of data were quantitative and qualitative. Data were collected by means of SSP validation sheets and disaster preparedness identification sheets. The techniques of data analysis were descriptive analysis of qualitative and quantitative to 5 grading scale. The result of the study shows that science module is feasible to be implemented in science learning and has potency to build critical thinking skills of junior high school students.

This study aimed to develop a product in the form of student worksheet based on the guided inquiry assisted by PhET simulation media on Vibration and Wave materials that was feasible according to validators, practical according to science teacher and student responses, and effective to improve student’s concept comprehension. This study was a research and development (RD), which was adapted from Thiagarajan’s 4D model. The main field-testing was conducted at SMPN 2 Sukoharjo via online upon 12 students of class VIII H. The design of the main field-testing was one group pre-test-post-test design. The analysis technique included the mean score, Meltzer’s standard gain test and Cohen’s effect size test. The results show that (1) the obtained student worksheet product based on guided inquiry assisted by PhET simulations was feasible according to the material and media experts with an excellent category, (2) the practicality of the student worksheet used by science teacher was in an excellent category and obtained good responses from the students, and (3) the effectiveness of the developed student worksheet was able to improve concept comprehension with a gain score in the moderate category and the effect size was categorized as a strong effect.

This study aims to determine: (1) the feasibility of students’ worksheet in natural science learning based on POE according to expert lecturers and natural science teachers, (2) students’ science process skill enhancement after using student worksheet in natural science learning based on POE, and (3) students’ responses to student worksheet in natural science learning based on developed POE. This research was a development research with 4D model. The research subject were 11 eighth grade students of Junior High School 2 Pleret. The product trial design used a one-group pretest-posttest design. Data analysis was the conversion of quantitative scores into qualitative values one a scale of four, calculation of percentages, and gain scores. The result showed that: (1) student worksheet in natural science learning based on POE to improve science process skills were declared feasible by expert lecturers and natural science teachers with very good category, (2) mastery of science process skills through observations included good category, while the improving science process skills in terms of pretest-posttest result was in the medium category, and (3) student responses to student worksheet in natural science learning POE was in the very good category.

This research aims to to know the seed viability of the two dates on the market. It has been done from July to November 2014, in the laboratory of  Mathematics and Natural Science Faculty, Yogyakarta State University. The type of Dates seeds are Sayer (oval-cilindrical, ±3cm, dark orange brown/more light than another),  and Lulu (round, ±2cm, dark maroon reddish /more dark than Sayer’s). Viability test by germination testing; conducted on plastic tray with cotton sheet and fabric covered; fill with 100 grains of seeds. Repeated 4 times. Incubation at room temperature (±30oC). The parameters were seed fresh weight, seed dry weight, seed moisture, germination percentage and germination rate. The results were analyzed by compare mean - independent samples t test of SPSS 18’th. The results showed that the viability of both of Date’s seeds from local’s market (Sayer and Lulu) is high. Sayer’s have better viability than Lulu’s (due to the germination percentage and germination rate). Keywords: date seed, viability test, germination test