Social acceptance is vital to students’ development. Being rejected by classmates can result in negative socio-emotional and academic outcomes. Finding relevant factors to be able to effectively support student social acceptance is especially challenging in inclusive classrooms because of the high heterogeneity of the student group. There is evidence that social acceptance is determined by the social behavior of students. In addition, current research suggests that affect-motivation dispositions, such as teacher attitudes, are related to teaching practices, which in turn are associated with student outcomes. This longitudinal study examines, on an individual level, the relationship between social behavior and the social acceptance of students. On a classroom level, the extent to which a teacher’s attitudes toward the inclusion of students with special educational needs affects their classroom management (i.e., implementation of clear rules and successful time management) is analyzed. In addition, the effect of teacher attitudes toward inclusion and classroom management on social acceptance in the classroom is investigated. The social acceptance of a sample of 580 students in 34 inclusive classrooms was assessed at the beginning and the end of the school year. In addition, student social behavior was rated by peers at the beginning of the school year. Teachers (n = 34) were asked about their attitudes toward inclusion at the beginning of the school year. One mathematics lesson in each classroom was videotaped to assess the teachers’ classroom management practices. Multilevel structural equation models revealed a positive relationship between student social behavior and their social acceptance in the peer group. Contrary to expectations, teachers’ attitudes toward inclusion did not predict their classroom management practices (i.e., implementation of clear rules and successful time management). As hypothesized, teachers’ classroom management predicted the level of social acceptance in the classroom, whereas teachers’ attitudes toward the inclusion of students with special educational needs did not. The study results are discussed in light of previous findings and implications for teacher education are described.

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Little is known about the mathematical development of students with intellectual disabilities (ID) in inclusive classrooms. It is important to have a researchbased understanding of the subject since inclusive education is becoming the norm in many countries, and an increasing number of students with an ID now attend mainstream schools. We investigated the learning gains of 38 students with ID from 31 grades 2 and 3 inclusive classrooms. Data on mathematics achievement were collected at the beginning and at the end of one school year. A cluster analysis revealed four homogeneous groups that differed significantly in their mathematical progress. Students in the same cluster improved in the same subskills. Prior knowledge is a significant predictor for progress and explains more variance than IQ. In addition, the acquisition of the quantitynumber concept, especially the linkage of quantities and numbers, seems to be an important factor for mathematical development. These results show that mathematics instruction needs to be tailored to the specific knowledge profiles of students.

Research in inclusive settings is complicated by the nested relationships between the general education teacher (GET), the special education teacher (SET) and pupils. In this study, the impact of SET resource and selected variables of teacher competence (professional mathematical knowledge SET, attitude towards inclusion GET, classroom management GET) on the mathematical achievement gain of typically developing pupils (TYP) and pupils with intellectual disability (ID) was examined. Mathematical achievement was tested at the beginning of the school year (t1) and the end (t2) in 34 inclusive classrooms (sample ID: n = 42; sample TYP n = 525). IQ and genderand the average mathematical achievement at class level in the sample TYPwere included as control variables. For pupils with ID, hierarchical regression modelling revealed that the mathematical knowledge at t1 explained most of the variance in mathematical achievement gain. For the group TYP, the results of a multi-level analysis showed that mathematical knowledge at t1, IQ and the average mathematical achievement at class level all had a positive effect on mathematical achievement gain. The more hours a SET was present in the classroom, the more the mathematical achievement of the group TYP increased. The other teacher competence variables had no apparent impact.