Explanation
The core dimensions of collaborative work are as follows:
1.Awareness - Individuals working together need to be aware of each other's work.
2. Articulation - Collaborating individuals must partition work into units, divide the units among team members, and then after the work is done, reintegrate it.
3. Appropriation - Adapting technology to one's own situation; the technology may be used in a manner completely different than expected by the designers.

The prime responsibilities of a Scrum Master are:
* Removes the obstacles/impediments that affect productivity.
* Shields the people from external disturbance.
* Responsible if the scrum process is correctly applied.
* Facilitate daily stand-ups, other ceremonies, schedule meetings, demo and other meetings.
* Help product owner in prioritizing the backlog and any feedback from the team.
* Facilitation of Retrospective meetings
* Workshops for planning, estimation, prioritization, issue resolution, performance improvements Reference: https://www.knowledgehut.com/interview-questions/scrum

Reference:
http://blog.scrumstudy.com/retrospect-scrum-project-the-lessons-to-be-learnt/

The Product Owner is the person responsible for achieving maximum business value for the project. He or she is also responsible for articulating customer requirements and maintaining business justification for the project.
The Product Owner represents the Voice of the Customer.