Quick and real-time plotting equations using the Winplot software can be employed to create accurate hybrid atomic orbitals without complicated scripting. Performing this task on their own, students can more easily understand and remember hybrid atomic orbitals, in terms of shape and orientation.

<p class="Abstract">This research aims to produce student worksheet based on interactive multimedia on photoelectric effect to grow science process skills that are attractive, easy, useful, and study to improve students learning out comes. The development design used in this research by Sugiono which implemented in 8 stages, they are potential and problem, data collecting, product design, validation design, revision design, product trial, product, and trial usage. Trial usage of the product was conducted at SMA Negeri 2 Bandar Lampung in October 2016 to November 2016 and the research subject was twelve grade classes. The sampling technique of product trial subjects done by purpose sampling, it took two same classes. One class used as an experimental class and the other class as a control class. Trial product design used Matching-Only Pretest-Post test Control Group Design method. Data collecting technique used questionnaire and test (pretest and post test). The data were analyzed by using a descriptive quantitative method. The conclusions of the research are: (1) Student worksheet to build scientific process skills on photoelectric effect should include predicting and hypothesizing activities, planning the experiment, doing the practicum, interpreting the observation, and communicating. (2) Student worksheet of development result has an attractiveness level with the average score is 3.27 or 81.74% with “interesting” category, ease level with the average score is 3.25 or 81.32 with “simple”, and usefulness level with the average score is 3.21 or 80.13% of “useful” category. (3) Student worksheet of development result is effective to improve students learning outcomes in science process skills with N-gain average is 0.63 with the medium.</p>

Nowadays the development of thinking skills has become the main focus in educational research. Standard of graduate competency mandate that graduates of schools to universities in Indonesia must have thinking skills.  Related to this, the goal of this quasi-experimental study was to describe the effectivity of Project-Based Learning (PjBL) student worksheets to improve students' critical thinking skills (CTS) in the topic of mixtures separation. This study was carried out in the SMPN 1 Pugung by using the Non-Equivalent (Pretest-Posttest) Control Group Design. The effectivity of PjBL student worksheets measured based on the n-gain and the effect size values. Statistically, the n-gain value of the experimental class was higher than the control class. The effect size value was in medium categorized.  These results indicated that the PjBL student worksheets were effective to improve students' CTS in the topic of mixtures separation. Keywords: student worksheets, project-based learning, critical thinking skills, mixtures separation

The hoax informations that spread through social media had a negative impact on society. Therefore, research had been conducted in Gedongtataan Upper Secondary School No.1  to describe the effectiveness of problem-based learning model on hoax informations in improving students' critical thinking skills. This study was used the matching only pretest-posttest control group design. The sample in this study was the 11th grade of IPA 4 (experimental class) and the 11th grade of IPA 5 (control class) which was obtained by using purposive sampling technique. The results showed that the average n-gain in the experimental and control classes was 0.7 and 0.6, respectively. Based on this, it could be concluded that the problem based learning model on the hoax informations was effective in improving students' critical thinking skills. Keywords: critical thinking skills, hoax informations, problem-based learning.

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