Table 5 Participant identified factors related to positive affective attitude about trials

i) Receiving support for the trial to be put in place

• Support given by the team

• Support that will be given by the researchers

• Management support

• Support from the research team and my employer

ii) The learning and development that they would gain from participating in a trial

• Training on how to provide [intervention] is a professional development

• Learning and CPD [Continuing Professional Development] opportunities

• Training given on how to approach this conversation

• Learning more about the research process through training and active involvement

iii) Children being represented in the trial

• Useful to gather information to represent children’s experiences

• Important to know about the children’s health, difficulties, and development as working with very complex children

• Background information is vital for creating results that reflect the participants (varying abilities, difficulties, circumstances, protected characteristics, etc.)

iv) Therapist and parent choice and control over if and how much they are involved in the trial

• Well explained to parents and gives them a choice

• Parental choice to take part

• Respects parent choice

• It is clear the parent can choose not to be involved

• The parent has the ultimate choice

• Lots of choices

• Level of choice

• Information to be shared is up to me and in my control

• Being able to choose information shared

• Still have the power to say what ok/not ok with

• The fact that I would have choice and autonomy over what info is shared