The research title is effects of the learning method and vocabulary mastery toward speaking skill (Experiments on x grade students of private vocational schools in Bogor). The purpose of this study is to find the influence of learning methods and vocabulary mastery on speaking skills. This research used Experimental research methods. An inferential analysis is done by ANOVA statistics (Analysis of Variance). The results of the study conclude: (1) This is a significant effect on the learning method toward speaking skills in private vocational high school in Bogor. This can be proved by the value of sig 0,000 <0,05 and count F 43,431, so it can be concluded that there is a significant difference in speaking skills in groups of students who were given Chinese Whisper learning methods. (2) There is a significant effect on vocabulary mastery toward speaking skills in the private vocational schools in Bogor. It can be proven by the sig value 0.002 <0.05 and count F 10.447 which means that there is a significant difference in the ability to speak in groups of students who have a high and low vocabulary. (3) There is interactive a significant effect of the learning method and vocabulary mastery toward speaking skill in the private vocational school in Bogor. This can be proved by the sig value 0.003 <0.05 and count F 9.736

The existence of activities in the laboratory becomes important for students to conduct experiments or research, and thus, improve their skills and abilities. However, the use of chemical and biological materials in the laboratory will certainly produce chemical and biological waste. The waste generated is potentially hazardous to health and can pollute or damage the environment either directly or indirectly. It is undeniable that laboratory activities can produce various types of waste, such as liquid and solid waste. This study aims to find out what is related to waste management in  a private vocational high schools in the city of Bogor. The results showed that there was no relationship between the variables of gender (p value 1.000), training (p value 0.354), knowledge (p value 1.000) and attitudes (p value 0.472) of respondents to the behavior of laboratory waste management. In conclusion, there is no correlation between waste management practices in schools and knowledge, attitudes, student gender, or training experience. To increase student knowledge and awareness about chemical waste laboratories, however, participation in chemical waste laboratory management training is required of students.

This research is aimed to get emperical data and analyze the effects of vocabulary and grammar mastery on writing skill in descriptive text at private junior high schools in Serang Banten. This research is done by Kolmogorov-Smirnov method, ANOVA Table,  Proportional Correct for testing the item difficulties, by biserial coefficient, and by Kuder Richarsson testing.  The research was held at Privates Junior High Schools in Serang Banten. Data collective done by giving test for writing skill (make a composition or an essay about an object description),  test for vocabulary mastery (multiplechoice/ 35 items), and test for grammar mastery (multiplechoice/ 35 items) given to class at MTs Al Ma’arif, MTs Nurul Basmallah and MTs Nurul Huda. The result of study identifies there are effects between Vocabulary and Grammar Mastery towards Student’s Writing Skill in Descriptive Text (Fo = 18.748 and Sig = 0,000 < 0,05; coefficient of 0.666 and the coefficient determination of 81.5%). There is effect of Vocabulary Mastery towards Student’s Writing Skill in Descriptive Text (Sig = 0.026 < 0,05 and ttest = 2,301; while  ttable = 1,88). There is effect of Grammar Mastery towards writing skill in Descriptive Text (Sig = 0.002 < 0,05 and ttest = 3,656 while  ttable = 1,88).