A user story is a short, simple description of a feature told from the perspective of the person who desires the new capability, usually a user or customer of the system.

They typically follow a simple template:

As a < type of user >, I want < some goal > so that < some reason >.

The Enhanced User Story is a way to expand traditional User Stories into a more detailed format with the goal of providing more clarity and understanding of the User Story.

The Enhanced User story adds two pieces of additional context:

1. Adverse Effect: what are the harms faced by not implementing this user story today?
2. Measureable Benefits: what Benefits will achieving this user story grant?

The ultimate goal of the Enhanced User Story is get to the "why" and to provide measurable criteria for priortization.