<![CDATA[Writing is one of the most difficult English skills for students because it requires a good understanding of grammar. One of the grammatical problems frequently encountered by students is the incorrect use of countable and uncountable nouns in writing. This study aimed to identify the types of errors made by first-grade students of SMP Negeri 7 Pulau Morotai in using countable and uncountable nouns in writing procedure texts and to determine the causes of those errors. The study applied a qualitative descriptive method to analyze the data.The participants of this study were 19 first-grade students of SMP Negeri 7 Pulau Morotai. The data were collected through a writing test and interviews. The findings revealed that there were three types of errors made by the students, namely misformation, omission, and misordering. Misformation was the most dominant error with 53 errors (38.97%), followed by omission with 50 errors (36.76%), and misordering with 33 errors (24.26%). The interview results indicated that the students' errors were caused by limited grammatical knowledge, lack of vocabulary mastery, insufficient understanding of countable and uncountable nouns, limited instruction from teachers, and lack of writing practice. Therefore, it can be concluded that students still experience considerable difficulties in using countable and uncountable nouns correctly when writing procedure texts.]]>
