The BSO-DOS© is an essential clinical tool in behavioural assessment and individualized care planning for persons living with dementia. As a reliable direct observation tool, it provides objective data about a person’s behaviour every thirty minutes for 24-hours over five consecutive days. The data collected within the BSO-DOS© is used to identify patterns, trends, and contributing factors associated with responsive behaviours/personal expressions. This information is critical to the development and evaluation of tailored care plans to address unmet needs. Specifically, the data can inform non-pharmacological approaches (e.g., communication strategies, meaningful engagement, environmental adaptation), as well as measuring the impact of medications.