The objectives of this research were as follows: 1. to studt the frequency of using complint forms; 2. to analyse the content of the complaint forms completed by the students; 3. to analyse Thai language errors made by each student in recording student behavior on the forms; 4. to study the students' opinions on the use of complaint forms in the classroom. The sample were a class of 39 second graders, consisting of 21 boys and 18 girls. Data were collected from complaint forms completed by the students in the second semester of the 1991 school year. The students' opinions on the use of complaint forms in the classroom were also collected. Content analysis and descriptive statistics were used in analyzing the data. The findings as follows: 1. As regards to the frequency of using the complaints forms. 1.1 Over a 16-week period, the frequency of complaining behaviour ranged from 11 to 88 times a week, with an average of 40 times a week. 1.2 The frequency of complaining during the first eight weeks varied morethan that during the last eight weeks. 1.3 The boys' complaining frequency was comparable to the girls. 2. As regards to content of the complaints. 2.1 The content of the complaints was more related to their classroom than to the students themselves. 2.2 As for complaints related to the students themselves, they were mostly related to physical attacks by classmates, followed respectively by bullying in ways other than physical attacks, verbal abuse and damage to personal belongings. 2.3 As for complaints related to classmates, they were mostly about classmates' behaviour in general, followed respectively by physical attacks, bullying in ways other than physical attacks, damage to personal belongings and verbal abuse. 3. O errors in the use of Thai. 3.1 The majority of errors involved syntax, followed respectively by error in spelling, word usage and spacing. 3.2 On syntax, errors mostly involved omissionn of words essential to the grammaticality of sentences. They were followed respectively by errors involving superfluous words and wrong word order. 3.3 On spelling, errors mostly involved incorrect use of syllable-initial consonants. They were followed respectively by incorrect use of tone marks and vowels, misspelling of entire words and incorrect use of syllable-final and muted syllable-final consonants. 3.4 There were instances of wrong words, superfluous words and use of a colloquil style in writing. 3.5 On spcacing, students world out put a space where no space should be put, and world, conversely, fail to put a space where one was required. 4 As for the students' opinions on th ecomplaint forms, most (97%) agreed with the use of complaint forms to help with classroom management, as the teacher would be informed of the entire class's behaviour at different times and different places.
