Very often the Scrum under Waterfall exist in organisations. It might not exist formally, but it can be required by contract or by law. The Scrum can be part of the Agile experiment.
The Scrum under Waterfall be because it’s practically for the organisation.
What will be the same/different using Scrum under Waterfall?
Focus on ‘Definition of Done’
Backlog = Project Plan
Less time on Backlog refinement
Less time on Sprint planning
Less negotiation during Sprint
But be aware, during Waterfall delivery:
Waterfall has poor communication / misunderstandings
Lack of transparency
Detachment from reality
Slow feedback / No feedback
Nothing is Done
So you need to do following things:
1: Work in Sprints
The Waterfall can be scheduled for example 12 months. If one Sprint last 30 days, you will have 12 Sprints.
2: Avoid ‘Earned Value’
The task can’t be done for 85.6 or 98%. The task is done or not done!
3: Focus on Done
Create a Definition of Done (DoD), work with DoD
4: Testing, testing, testing
Test throughout Sprints, start to design your tests at the beginning of project. Test until the end
5: Get Frequent Feedback
Gather feedback early. Show the increment before it’s actually due