I am doing a web application in asp.net. The application maintains the health records of the citizens and take their symptoms as a input and provide the appropriate disease name as per the symptoms. and also, it put a mark on the google maps by taking the citizen address. so that, we can check the spread of the disease.
I am using 3-tier architecture pattern for this project.
Now, Please suggest me some best quality attributes, and explain about them in detail. which I can get for the 3-tier architecture.