Theoretical models and empirical evidence suggest parental involvement in general education is beneficial for children’s educational outcomes and that motivational factors may contribute to explaining parental involvement in children’s education. Few studies, however, have examined the role of parental involvement in children’s writing outcomes and, to our knowledge, none has investigated the motivations of Parents/Carers to support their children’s writing development in the first place. In this study, we aimed to address this gap by measuring Parents'/Carers' autonomous and controlled motivations for supporting their children’s writing at home and their engagement in writing activities with their children, and then assessing the links between parental motivations and involvement, and children’s writing quality and attitudes toward writing. Participants included 159 Year 2 children and their Parents/Carers. Structural equation modelling showed indirect effects between Parents'/Carers' autonomous motivation and children’s writing quality via the mediators of parental involvement and children’s attitudes towards writing. Conversely, Parents'/Carers' controlled motivation had no significant association with children’s writing outcomes. Findings suggested that, when Parents/Carers are autonomously motivated and involved in writing activities with their children at home, their children show stronger positive attitudes towards writing. Educational implications include encouraging home-school initiatives that foster autonomous motivation in Parents/Carers and support Parents/Carers in engaging in a wide range of enjoyable writing activities with their children at home, creating a community where writing is valued across home and school contexts.

The current study examined the impact of adapting an evidence-based instructional approach to develop ninth-grade students’ argumentative writing and self-regulated strategy use. Following the Self-Regulated Strategy Development (SRSD) model, strategies to plan and write argumentative texts were implemented in two Portuguese classrooms. The model relies heavily on the use of mnemonic strategies to support instruction. Thus, incremental effects of using dual-coding mnemonics (i.e., visual and verbal mnemonics) were explored when implementing SRSD instruction. For the first group (n = 23), SRSD instruction included verbal and visual mnemonics; for the second group (n = 25), SRSD instruction included verbal mnemonics alone. Groups were compared with a control group (n= 25) receiving standard writing instruction.The following findings were significant: a) SRSD instruction increased writing quality, organising, and spontaneous planning; b) dual-coding mnemonics enhanced writing quality, development of ideas, organising, language clarity, and spontaneous planning; c) national exams completed 15 weeks after instruction reinforced the effectiveness of the adapted SRSD strategies. The process of culturally adapting and implementing SRSD instruction to teach argumentative writing will be discussed, including the potential incremental effects of adding visual mnemonics to the SRSD instructional routine.