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Table 2 Data sources used to address PD COMM process evaluation objectives and analytical questions

From: The PD COMM trial: a protocol for the process evaluation of a randomised trial assessing the effectiveness of two types of SLT for people with Parkinson’s disease

Objectives

Analytical questions

Data sources

Establish a programme theory that explains how PD COMM interventions are expected to work

What are the components of the PD COMM interventions? Which are core? Which are peripheral?

What are the interactions between the components of the PD COMM interventions?

OBS, TQ, therapists’ interviews, TRF, HBT diaries

Investigate the implementation of trial interventions from the perspective of therapists

What were therapists’ opinions of the PD COMM interventions?

Therapists’ interviews, CIRs, OBS

What experience of delivering the PD COMM interventions did the therapists have prior to the start of the trial?

TQ, therapists’ interviews

What were therapists’ motivations for joining the trial?

TQ, therapists’ interviews

To what extent did the training help therapists ‘feel ready’?

OBS, therapists’ interviews

How did ‘learning time’ impact the way therapists delivered the PD COMM interventions?

TQ, therapists’ interviews, TRF

To what extent did therapists feel supported in their role as research therapists?

TQ, therapists’ interviews, CIRs

What challenges did therapists face? How did they manage them?

OBS, therapists’ interviews, CIRs

How did therapists feel about the way they recorded content and results from therapy sessions?

Therapists’ interviews, TRF

How did therapists work on building rapport with participants?

Therapists’ interviews, TRF, CIRs

How did the PD COMM interventions compare with the therapists’ routine way of practicing?

TQ, therapists’ interviews, CIRs

What are the therapists’ views regarding the resources allocated to the trial?

TQ, therapists’ interviews

How have therapy outcomes impacted the therapists’ level of motivation/engagement?

Therapists’ interviews, CIRs

To what extent did therapists tailor the PD COMM interventions to participants’ needs?

TQ, therapists’ interviews, TRF, CIRs, HBT diaries

How did therapists feel about their research role versus their client-centred approach to practice?

Therapists’ interviews, CIRs

To what extent did therapists follow the trial intervention protocol?

TQ, therapists’ interviews, TRF

To what extend did therapists feel supported by their environment?

TQ, therapists’ interviews, CIRs

Investigate participants’ experiences and views about their involvement in the PD COMM trial

To what extent did participants engage in the trial?

Participants’ interviews, HBT diaries

What did participants think of their involvement in the trial?

Participants’ interviews

How did the therapy sessions impact their everyday routine?

Participants’ interviews, HBT diaries

What were participants’ motivations for joining the trial?

Participants’ interviews

Can participants identify positive/negative impacts of their involvement in the trial?

Participants’ interviews

  1. Abbreviations: CIR Critical incident report, HBT Home-based therapy, LSVT Lee Silverman Voice Treatments, OBS Observations of Lee Silverman Voice Treatments training and trial workshops, SLT Speech and language therapy, TQ Therapist questionnaire, TRF Treatment record form