1. Introduction
In this globalization era, language is important especially English. With English, individuals
in various parts of the world can still communicate well even though they have different
geographical and cultural backgrounds. For this reason, many countries have English as a
second language. The primary reason why English became an international language was due to
the strategy of the British Empire, including in the area of trade. At the time Britain had a vast
territory and English was the main medium of communication. Conveying understanding is a
difficult task. The best or most effective way to teach English vocabulary must be determined by
the teacher. According to Shatz (2014:96), “The term language learning strategies refers to the
processes and actions that language to learn or use a undertake to learn more effectively.” Then,
According to Matruty (2021:24), “Vocabulary is the building block of a language that contains
all the information about the meaning and usage of words in that language. Therefore, it is
important to learn vocabulary in order to understand the meaning of the information being
conveyed.”
A list or collections of vocabulary in a particular language is called vocabulary. It is the list
of words that students use to communicate with each other. Learning a language requires a rich
vocabulary to master the language skills, namely listening, speaking, reading and writing, as
vocabulary is supporting element in conversational skills. According to Hamer & Rohimajaya
(2018:169), “Vocabulary is central language skills and forms the foundation for learning to
speaking, listening, reading and writing.” Then, according to Novari at all (2021:30),
“Vocabulary is a key component that must be acquired to master English.”
According to Nasution P.S (2019:2), “Vocabulary is key element when learning a foreign
language. It is fundamental skill that enables students to learn other skills such as listening,
speaking, reading and writing.” Vocabulary cannot be separated from other elements of English
language, English language learning ability is especially affected in junior high school. Students
can communicate well and express their thoughts, emotions and feelings well with an
appropriate number of words stored in their memory. Based on several vocabulary definitions
above, the researcher concluded that vocabulary is the most important part of language skills,
without vocabulary students will experience difficulties in speaking, writing and vocabulary is a
basic competency for students to obtain other competencies such as listening, speaking, reading
and writing.
2. Method
This research uses quantitative approach with experimental methods. According to Creswell
(2014:247),“A mean for testing objective theories by examining the relationship among
variables.” Some of these variables can be measured, usually using instruments so that the
numbered data can be analyzed using statistical procedures. Quantitative research seeks
theoretical assumptions that can be tested and confirmed. And looking for scientific
explanations that involve discovering laws that do more than just govern behaviour. The final
written report has a structure consisting of an introduction, literature and theory, methods,
results and discussion.
In addition, data was taken using an quasi experimental design. According to Creswell
(2015)." Quasi-experiments are experimental plans that are: carried out without randomization,
but involves assigning participants to groups. The quasi-experimental approach used was a one