## 3 Results
### Develop Phase  
The development phase focused on creating and refining the iteration flows and digital interface for the proposed system. Engagement with potential users and technical experts was maintained throughout the phase through rapid prototyping, iteration, and testing loops. This helped to ensure that assumptions were being continuously validated against the developed requirements specifications. The first stage in development involved the creation of a Unified Modeling Language (UML) diagram (Figure 3), to visually represent the system's information architecture along with its main actors, roles, and actions. The UML diagram was crucial in defining the initial high-level categories required for conducting the affinity mapping activity. Categories included view profile, therapy and exercises, dashboard, contact physiotherapist, and smart sleeve. These represented the features that patients would primarily interact with when navigating through the system. Considering that caregivers would have an external data collection dashboard, their engagement with the Sana app would primarily be when communicating remotely with the patient via the 'Contact' navigation item. Once the system architecture was determined, an affinity mapping activity was conducted. The key research findings from the discovery phase were converted into a range of design ideas and potential system functions and features. These were then organized into the following established high-level categories: profile, therapy and exercises, dashboard, and contact. This activity was conducted to identify gaps in the authors' domain knowledge. A list of assumptions and questions was documented (Table 2) which was used to structure a follow-up interview with a physiotherapist (see Table 2). * Profile: What information, if any, is a patient required to know regarding their injury? How often is a patient called up for follow-up treatment? What kind of advice or medication will a patient be given regarding pain and swelling management? Figure 2: Current paper based anterior cruciate ligament reconstruction (ACLR) rehabilitation procedure: pre-Sana. * Therapy and exercises: Will a patient be provided additional exercise equipment? If so, what are some examples of this equipment? How often do patients engage in exercise? How much input, if any, should a patient have in terms of deciding what exercises? Should patients be given a range of alternative exercises to perform if they are struggling? Is diet something patients need to regularly monitor during rehabilitation? * Dashboard: What are the different milestones that patients have during phase 1 of rehabilitation? What kind of data do caregivers need to collect about patients? How do patients currently determine whether treatment is working? What are the commonly used metrics to determine a patient's rate of recovery? * Contact: How much flexibility do patients have in scheduling appointments themselves? The follow-up interview helped answer the key questions and assumptions identified during the affinity mapping activity. Adjustments to the affinity map were made using insights gathered from the interview. This included disregarding features such as patient appointment scheduling, diet monitoring, and the ability for patients to choose their exercises from a list of approved exercises. From our findings, it was clear that exercise quality, exercise compliance, and pain levels were the most critical metrics caregivers use when completing assessment of whether a patient is successfully recovering. Figure 3: Unified Modeling Language (UML) diagram for the Sana system.