• It’s about individual feature fitness
• Are specific to an PBI, created during refinement, to guarantee individual feature fitness
• they have to be black and white, no room for interpretation
• May address:
  • Functionality concerns often regards to the UI
  • Acceptance test in form of scenarios or concrete examples (specification by example)
  • Input-output dataset for specific testing criteria
  • Sometimes algo addresses Non-functional requirements to ensure product doneness