The purpose of this guide is to enable users of the Singapore Environmental Assessment Tool (SEAT) to confidently and successfully complete an assessment of an environment used to accommodate people with dementia. The SEAT provides a systematic framework for reviewing environments for people with dementia and identifying areas for improvement. It contains questions that have been designed to gather information on how well the ten principles described below have been put into practice. The SEAT is designed to be used by a non-design professional and can be completed by a member of staff or a person visiting the facility with a minimal knowledge of dementia care. However, it is important that the person completing the SEAT is familiar with the design principles underpinning it prior to starting the assessment, users should familiarise themselves with the principles by thoroughly reading the description of the principles below.