Abstract
Autistic pupils in mainstream secondary schools often experience unmet needs, yet limited research has examined the combined influence of multiple theoretically relevant predictors of teachers' self-efficacy and intentions to implement inclusive practice for autistic pupils. This mixed-methods study surveyed 126 staff from six secondary schools, assessing autism-specific training, perceived inclusiveness of the school environment, experience with autistic pupils, neurodiversity-affirming attitudes, personal connection to autism, and staff role. Teacher self-efficacy and intentions for inclusive practice were measured using adapted scales, and hierarchical multiple regression identified significant predictors. Autism-specific training, perceived quality of the inclusive environment, years of experience with autistic pupils, classroom teacher role, and neurodiversity-affirming attitudes predicted higher self-efficacy. Together, these explained 42.1% of the variance. Intentions for inclusive practice were predicted by neurodiversity-affirming attitudes and training, explaining 27.5% of the variance. Thematic analysis of open-text responses revealed practical adjustments including clear communication, sensory adaptations, and emotional regulation supports, alongside challenges such as resource constraints, complex classroom dynamics, and inconsistent institutional support. Findings highlight the value of targeted autism-specific training and fostering neurodiversity-affirming attitudes, supported by inclusive school environments, to strengthen teacher capacity and sustain inclusive practice. Lay Abstract Many autistic pupils in mainstream secondary schools do not have their needs fully met. This can affect their learning, well-being, and opportunities to take part in school life. Teachers play a vital role in making schools more inclusive, but their ability and motivation to do so can be influenced by many different factors. Most research has looked at these factors separately. This study is one of the first to examine several important influences together, to see which are most strongly linked to teachers feeling confident (self-efficacy) and intending to use inclusive practices for autistic pupils. We worked with 126 staff from six secondary schools, including teachers, leaders, teaching assistants, and other support staff. We looked at the impact of autism-specific training, school environment, experience with autistic pupils, attitudes towards neurodiversity, personal connection to autism, and staff role. Participants were also asked to describe examples of strategies they use to support autistic pupils, and the challenges they face. We found that confidence was highest among staff who had autism-specific training, worked in a more inclusive school environment, had more years of experience with autistic pupils, were classroom teachers (rather than in leadership roles), and had more positive, neurodiversity-affirming attitudes. Together, these factors explained more than two fifths (about 42%) of the differences in how confident staff felt. Intentions to use inclusive practices were strongest among staff with neurodiversity-affirming attitudes and autism-specific training, and these two factors together explained just more than a quarter (about 28%) of the differences in how strong those intentions were. Staff described a wide range of helpful strategies, such as giving Original Article