Outcome
A result for a stakeholder enabled by one or more outputs. An outcome is what the customer wants to achieve (e.g., "Sales increased by 10%"), whereas an output is just the deliverable (e.g., "A new CRM system").
Impact
Focusing on outputs instead of outcomes is the primary reason IT projects are considered failures even when delivered "on time and on budget."
Weinto take
We contract for Outcomes, not Hours. We don't want to be paid for writing code; we want to be paid for moving the needle on your business metrics. This aligns incentives: we win when you win.