Collaboration, co-production, and co-design: moving ahead in brain impairment

‘Co’ approaches, including collaboration, co-production, and co-design, are hot commodities in research right now. However, evidence-based research is only starting to be published that demonstrates best practice for these ‘co’ approaches. This special collection aims to showcase both the successes and challenges and build on the evidence base for planning and implementing rigorous and influential ‘co’ approaches’ in research across our field. This article belongs to the collection: Collaboration, Co-production, & Co-design: Moving Ahead in Brain Impairment.