A systematic review was presented in Part one of this thesis, which aimed to identify measures of social support for caregivers of people with dementia (PwD) and to investigate their psychometric properties. Social support are resources perceived or provided by non-professionals in support groups or informal helping relationships. It was suggested that the availability of resources including social support could protect caregivers against stress and burden, which could be a protective factor for PwD and their carers. Having well-validated and standardised measures for this population is crucial for research and clinical use, especially for making meaningful comparisons between results across studies done across different time and places. Part two of the thesis involved an empirical paper that aimed to complete a large-scale psychometric validation of two positive psychology outcome measures for PwD in Hong Kong. Positive psychology in dementia shifts away from the traditional loss-oriented model to a non-pathologising approach that emphasises the strengths or capabilities used to achieve wellbeing despite difficulties. Due to unforeseeable challenges from COVID-19, it was not possible to recruit the sample size intended to complete in-depth analyses and draw conclusive results. Regardless, the preliminary results have provided valuable insight to the use of positive psychology approach and measures for PwD in Hong Kong. Part three involved a critical reflection and further discussion on findings while elaborating on the difficulties and challenges in the process, particularly in the face of COVID-19, as well as any dilemmas or scope for future research.