Background: Within the context of the Special Interest Research Group (SIRG) on Persons with Profound Intellectual and Multiple Disabilities (PIMD), researchers often discuss the methodological problems and challenges they are confronted with. The aim of the current article was to give an overview of these challenges. Methods: The challenges are centred on six topics. These reflect the main components of a study's design: (a) participant demarcation, (b) participant recruitment, (c) data collection and instruments, (d) data analysis, (e) ethics/including the "voice" of persons with PIMD and (f) theoretical models. Results: Next, to describing the specific challenges, possible solutions and pathways to address them are discussed. These are illustrated by recent studies by the authors and other researchers in the field. Conclusions: The current contribution wants to stimulate further discussion and exchange of ideas, and the development of creative research techniques.

Background & Aims: Parenting factors are one of the most striking gaps in the current scientific literature on the development of young children with significant cognitive and motor disabilities. We aim to explore the characteristics of, and the association between, parental behavior and children's interactive engagement within this target group.Methods & Procedures: Twenty-five parent-child dyads (with children aged 6-59 months) were video-taped during a 15-minute unstructured play situation. Parents were also asked to complete the Parental Behavior Scale for toddlers. The video-taped observations were scored using the Child and Maternal Behavior Rating Scales.Outcomes & Results: Low levels of parental discipline and child initiation were found. Parental responsivity was positively related to child attention and initiation.Conclusions and implications: Compared to children with no or other levels of disabilities, this target group exhibits large differences in frequency levels and, to a lesser extent, the concrete operationalization of parenting domains. Further, this study confirms the importance of sensitive responsivity as the primary variable in parenting research.Keywords: parental behavior; child interactive engagement; severe and multiple disabilities; profound and multiple disabilities

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Background Children with a significant cognitive and motor developmental delay are pre‐symbolic communicators. The primary aim of this study was to reveal the variability within the communicative functioning of this group of children in terms of communication level, the reasons to communicate and behavioural expressions. Methods Twenty‐six children between 14 and 58 months with a significant cognitive and motor developmental delay were recruited. The Communication Matrix of Rowland (2011, Communication Disorders Quarterly, 32, 190) was used to integrate different sources of information on the children's communicative functioning. Results These children primarily communicated at the level of pre‐intentional and intentional behaviour, aimed at refusing, obtaining and, to a lesser extent, social purposes. Conclusions To develop or adapt early intervention strategies, and to monitor progress in communicative development, an even more nuanced view on these children's communicative utterances in terms of frequency, duration, idiosyncrasy and context relatedness is needed.

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