Final answer:
Good Product Backlog Items are defined by measurable criteria and necessary constraints. They must be achievable, relevant to project goals, and time-bound with specific deadlines.
Step-by-step explanation:
Characteristics of good Product Backlog Items (PBIs) involve certain criteria and constraints that guide the development process. The criteria are standards or attributes of a design that can be measured, whereas the constraints are limitations or conditions that must be satisfied by the design.
Good PBIs should be achievable, meaning they must be realistic and attainable with the barriers that could be overcome. They should also be relevant, supporting other goals and making sense within the larger context of project objectives. Lastly, a good PBI is time-bound, having a specific target date or deadline which helps in prioritizing and tracking progress. The quality of a design is often evaluated by how well the prototypes meet these defined criteria and how they operate within the specified constraints.