How much time does Product backlog refinement take?
The refinement is very important and can take quite some time for that reason, however, it should not endanger the sprint goal.
Product backlog items are refined by
In the scrum guide it says: 'The Scrum Team may refine these items during this process, which increases understanding and confidence.'
What are two differences between unit tests and integration tests?
Unit tests are testing the smallest units of code possible and integration tests are testing the components of the system together. Unit tests aims at isolated pieces of behavior and integration tests could be composed of unit tests to test components.
What activities would a Product Owner typically undertake in the phase between the end of the current sprint and the start of the next sprint?
There is no time in between sprints, so there cannot be activities.
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