A high level yet detailed plan that conveys the project's primary design goals, key milestones, stakeholders, SMEs, team roles, proposed timelines, resource allocation, and any risks with the work load or timeline. The execution plan lays out the timeline for the life of a project, with intervals and checkpoints across the phases.

Discover, Explore, Test and Listen. These phases relate to the overall course of action taken to hit a milestone or deliver an artifact. For example; inside the listen phase, one might incorporate MVP feedback to improve the final deliverable.

Each breakdown phase can include various milestones of size and weight. These are touchpoints or mile markers towards the end goal laid out in the execution plan.

Typically a larger scale deliverable such as a stakeholder request, mockup, analysis, design critique, etc. Artifacts materialize over the course of the milestones achieved. Milestones help timetable if the artifact delivery is on schedule.