This study aims at (1) investigating the quality of “When English RingsA Bells” textbook to teach speaking skill for grade seventh of Junior High School,and (2) developing video-based supplementary materials to teach speaking skillfor grade seventh of SMP 12 Surakarta. This study is categorized as a Researchand Development study. There are 2 stages in conducting this study. The first isexploration, which consists of need analysis, library research, prototype design,and expert judgment. The second is model development which consists ofprototype try out and evaluation.The result of need analysis revealed that “When English Rings a Bell”(WERB) has some weaknesses especially for teaching speaking skill. Thematerials in WERB were still limited. The teacher had to add some materials fromother resources. Before developing the materials, the researcher made anevaluation towards WERB for grade seventh as the existing material by using theconstruct of good speaking materials. The result of the textbook analysis showsthat WERB for seventh grade does not reflect the principles of scientific approachteaching procedures. Moreover, WERB for seventh grade does not accomodateone of the four indicators of speaking namely grammar. WERB for seventh gradedoes not provide authentic materials to teach speaking skill. The students shouldbe given opportunities to have disscussion and presentation using the targetlanguage.The researcher designed the prototype of video-based supplementarymaterials for teaching speaking skill based on the Curriculum 2013. The first stepis analyzing the core and basic competence in the Curriculum 2013. Then, theresearcher drew some indicators in order to find the appropriate materials toachieve the learning goals of speaking skill. The draft, then, was evaluated by theexpert in TEFL. This stage is carried out for finding out the weaknesses of theprototype design whether or not the draft has fulfilled the criteria of goodspeaking materials based on 2103 curriculum. After obtaining the feedback fromthe expert, the researcher revised the draft. The supplementary materials are triedout three times in order to validate the feasibility.It is hoped that the video-based supplementary materials can help theteacher for giving additional materials for teaching speaking. The researcher alsohopes that the students’ motivation and the situation of the classroom improvesignificantly using the video-based supplementary materials.Keywords: Video-based, Supplementary Materials, Curriculum 2013, Speakingskill