Question

Who should estimate the volume of work of each backlog item?

1) Product Owner, because s/he has the full responsibility for the Product Backlog, and knows the items more than others
2) Scrum Master, because s/he's responsible for planning
3) Development Team members, because they are supposed to do the work and they know best how much work is required to complete each item
4) none

Answer 1

The Development Team members should estimate the volume of work for each backlog item in Scrum.

Step-by-step explanation:

The volume of work estimation for each backlog item in Scrum should be done by the Development Team members. They are responsible for understanding the scope and requirements of each item and have the expertise to estimate the effort required to complete it. The Product Owner can provide guidance and insights, but it is the Development Team who ultimately determines the volume of work.