New Rear Anti-tip Device for Manual Wheelchairs: Subjective Input (RAD-SI)

Inclusion Criteria: All participants: * at least 18 years of age * willing to participate * alert * co-operative * able to see and hear the video demonstrations * able to communicate in English * have the capacity to provide informed consent * committed to setting a scheduled time for the study activity Wheelchair service providers: * Occupational Therapists or Occupational Therapy Assistants who self-identify as being regularly involved in the wheelchair provision process wheelchair users: * person who has used a manual wheelchair for at least one month caregiving participant: * spends an average total of at least 2 hours per week with the manual wheelchair user that includes manual wheelchair mobility online survey: * self-identifies as being regularly involved in the wheelchair provision process Exclusion Criteria: • emotional problems that might make participation unsafe or unpleasant