With the outbreak of the Corona pandemic, hospitals faced enormous challenges in terms of running out of resources and space and the inability to separate patients infected with the Corona virus from patients suffering from other diseases. The Corona virus starkly highlighted the lack of reliable design strategies to support strategic and flexible decision-making in hospitals, to be able to adapt and respond to all future requirements and rapid changes, and to respond to contemporary and future public health emergencies. Therefore, flexibility was the main component of hospitals' ability to meet these everchanging needs. Therefore, the research aims to identify technical solutions to ensure flexibility in designing hospitals by studying and identifying flexibility assessment tools, conducting a critical review of them, and developing a new assessment tool for assessing hospitals flexibility. To determine in what measure hospitals follow the principles of flexibility. In this study, flexible assessment tools in hospitals were identified and compared, followed by a critical review of them, and then a new developed assessment tool was deduced to serve as a constant reference for hospital designers. Testing the new tool on international models to determine its effectiveness and identifying deficiencies in hospitals to avoid these design problems the new version of the AFAT framework (Advanced Flexibility Assessment Tool) consists of evaluation criteria that are classified under the four levels of flexibility (hospital complex, building, functional unit, and room) and are divided into measurable variables with scores ranging from 0 to 5. Testing case studies enabled the assessment and validation of the validity and reliability of the AFAT to support decision-makers in addressing flexibility in hospital design. To accommodate current hospital activities, adapt to time-sensitive physical changes, and respond to present and future public health emergencies, healthcare facilities must be planned and constructed using flexible design principles