Architecture Requirements are Ilities
Architecture Requirements are Ilities The business analyst(s) will collect the functional and system requirements. The architecture has other requirements. It is the job of the software architect to find and talk to the right people about them -- the system "ilities." An "ility" is a characteristic or quality of a system that applies across a set of functional or system requirements. So, performance is an "ility" because it is applied against some of the functional or system requirements. Anything that can be expressed in the form "for a set of functional or system requirements, the system must fulfill them this way (this fast, this reliable, etc.)" is an "ility." It is not always easy to help the users find all of the ilities that they are assuming apply to their current system or will apply to the new system. You might try using this list of ilities that commonly come up to jump start the conversation. Review i