Scaling Scrum allows teams and organizations to excel iteratively and incrementally deliver valuable products of “Done” working releasable software within a Sprint. Key focus areas are Definition of Done, Definition of Ready & Scaling Scrum.
The Definition of Done is a formal description of the state of the Increment when it meets the quality measures required for the product. It is a list of requirements that a user story must adhere to for the team to call it complete. The same definition guides the Developers in knowing how many Product Backlog items it can select during Sprint Planning.
Although this may vary significantly per Scrum Team, members must have a shared understanding of what it means for work to be complete, to ensure transparency. Product Backlog item which does not meet the Definition of Done, cannot be released or even presented at the Sprint Review. Instead, those will return to the Product Backlog for future consideration.
If the Definition of Done for an increment is part of the standards of the organization, all Scrum Teams must follow it as a minimum. If it is not an organizational standard, the Scrum Team must create a Definition of Done appropriately for the product. If there are multiple Scrum Teams working together on a product, they must mutually define and comply with the same Definition of Done.
Acceptance Criteria of a User Story consist of a set of Test Scenarios that are to be met to confirm that the software is working as expected. The difference between these two is that the DoD is common for all the User Stories whereas the Acceptance Criteria is applicable to specific User Story. But both DoD and Acceptance Criteria must be met in order to complete the User Story.
DoD Examples: Code peer-reviewed? Unit tests passed? Functional tests passed? User Acceptance tests passed? Etc
Acceptance Criteria Examples: A user cannot submit a form without completing all the mandatory fields, Payment can be made via credit card, etc.
Definition of Ready is a set of agreements that let you know when a user story is really done, the team makes explicit and visible the criteria (generally based on the INVEST matrix) that a user story must meet prior to being accepted into the upcoming iteration. Few benefits are
A “ready” backlog item needs to be clear, feasible, and testable:
Scrum is a simple framework for delivering software products using an empirical approach in which teams deliver value in small increments, inspect the results, and adapt their approach as needed based on feedback. It consists of a small set of events, roles, and artifacts, bound together by practices, and enlivened by values that are the key to making it work.
Nexus extends Scrum to guide multiple Scrum Teams on how they work together to deliver working software in every Sprint. It shows the journey these teams take as they come together, how they share work between teams, and how they manage and minimize dependencies.
Scaled Professional Scrum is based on the unit of development called a Nexus. The Nexus consists of up to 10 Scrum teams, the number depending on how well the code and design are structured, the domains understood, and the people organized. The Nexus consists of practices, roles, events, and artifacts that bind and weave the work together to produce a whole.
LeSS is a framework for scaling agile development to multiple teams. The framework scales up with minimal additional process compared to single-team Scrum. i.e. use the as little process as possible to get multiple Scrum teams to work well.
For Example:
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