It's a common practice to define Non-Functional Requirements Service Level Agreements using emotional states such as frustration. It is a cool idea to go even further and describe its' relationship to the persona as well as other emotional states.

This change improves the contextual understanding, mainly the emotional states of the experiences, of Non-Functional Requirements, we have experimented with including emotional states related to each NFR SLA.

We tried to attached different emotional responses for a few different SLA values for a given NFR. It's too early to learn whether it worked, but certainly, the first signs are striking.