<qa>  What is the practice based approach?A complete record of patient care will be collected to provide detailed information on the management and outcome of mild cognitive impairment and dementia and the profile of patients at participating sites. The data will be used to build models looking at the effect of management of these conditions on principal clinical events, health status and economic outcomes. This will provide the foundation for subsequent objective and prospective evaluation of evidence-based strategies for the optimal treatment of mild cognitive impairment and dementia in Australia. This study is not prescriptive, but will instead examine the influence of a whole range of routinely used management strategies on clinical and economic outcomes among mild cognitive impaired and dementia patients in Australia. This practice based approach is increasingly widely used and is a useful tool for elucidating the relative effectiveness of different management strategies and for exploring relationships between patient characteristics, treatment and outcomes. Observational study - no study drug administered. 