Abstract :
This research was classroom action research which is aimed to find out
that inquiry- based learning method can improve the students? English writing
ability of second grade MTS Al-Mahrus Medan at Jl. Rumah Potong Hewan,
lingkungan VI, Kel. Mabar Hilir. Kec Medan Deli, Kota Medan, Sumatera Utara
also to find the teaching ?learning process writing in the class. The subject of this
research using classroom action research (CAR). The object of this research was
to the improvement of students? English writing ability through inquiry-based
learning method (IBL). It was conducted in two cycle. Each cycle consist of
planning, action, observation, and reflection. The data were gathered through
quantitative and qualitative data. The finding show that the students concern
actively in learning process, they were enthusiasm in conveying their opinions,
asking and respond the question, doing the text in english writing teaching
learning process. The students? English writing ability improve from pre-test to
post-test. The mean of pre- test in cycle I is 60.93% and the mean at post ?test in
cycle I is 68.87%%. Meanwhile, the result post-test in cycle II is 2127 and the
mean post-test in cycle II is 75.12%. The result shows that students? English
writing ability can improve from first meeting to the last meeting through inquirybased learning method. In other words, students were actively and enthusiast in
English writing during teaching- learning process by used inquiry-based learning
method.