| Learning English employs four different skills: listening, reading, speaking, and writing, whereby it is supported by the three language components, which are grammar, pronunciation, and vocabulary. For Indonesians learning the English language, building vocabulary proved to be difficult due to most used option for learning is through school textbooks, which lack the incidental learning of vocabulary that extensive reading otherwise may provide. This study aims to investigate whether the participants learn new vocabulary accidentally due to the impact of extensive reading and whether word frequency and length factors have an impact on incidental vocabulary learning. The participants of this study were junior high school students, aged 15 years old, that scored a minimum of 70 on their English subject. They were to complete a pre-test, read the chosen novel "The Fault in Our Stars", and then complete a post-test to see how much they have learned new vocabulary after reading the novel extensively. After comparing the answers on both of the participants' tests, there is a low-pick-up rate of new vocabulary as a result of extensive reading and that word frequency and word length have little impact on incidental vocabulary learning. The findings suggest that there should be more time, more participants and relevant & appealing reading material for English language learners in order to enhance incidental vocabulary learning. |