A multi-level structural equation model was used to examine the relationships between the homework purposes reported by teachers (i.e. practice, preparation, participation, and personal development), homework quality perceived by students (e.g., homework related to the class material taught) and homework variables (i.e. effort, and homework performance) collected through different sources, and mathematics achievement. Participants were 4265 6th graders and their teachers ( N = 101) from 199 classes. The direct and indirect relationships between variables were analyzed. Data showed that (a) homework purposes, students’ homework variables and mathematic achievement are associated, and (b) the relationship between homework purposes and mathematic achievement is mediated, by students’ perception of homework quality. Research and practice implications are addressed.

Students’ writing constitutes a topic of major concern due to its importance in school and in daily life. To mitigate students’ writing problems, school-based interventions have been implemented in the past, but there is still a need to examine the effectiveness of different types of writing interventions that use robust design methodologies. Hence, the present study followed a longitudinal cluster-randomized controlled design using a multilevel modeling analysis with 370 fourth-grade students (nested in 20 classes). The classes were randomly assigned to four conditions: one comparison group and three writing types of writing interventions (i.e., week-journals, Self-Regulation Strategy Development (SRSD) instruction and SRSD plus Self-Regulated Learning (SRL) program using a story-tool), with five classes participating in each condition. Data supports our hypothesis by showing differences between the treatment groups in students’ writing quality over time. Globally, the improvement of students’ writing quality throughout time is related to the level of specialization of the writing interventions implemented. This is an important finding with strong implications for educational practice. Week-journals and writing activities can be easily implemented in classrooms and provides an opportunity to promote students’ writing quality. Still, students who participated in the instructional programs (i.e., SRSD and SRSD plus story-tool) exhibited higher writing quality than the students who wrote week-journals. Current data did not find statistical significant differences between results from the two instructional writing tools.