During the planning stage we plan for resources, we schedule, we allocate time for defect management, we expect certain rework & account for that. We plan the scope, we stagger the development activities and plan for deployment. Planning for quality is mostly relegated to allocating time & Resources for product testing or verification & validation activities.

I would say, we need to ask ourselves during planning, as to “what proactive steps can we take to Improve Quality, Productivity, reduce defects and rework?” The answer to this question can come from previous executed projects,experience or any other sources

The term Execution excellence is intrinsically dependent on planning excellence.
With most failures attributed to deficiencies in planning, Continual proactive strengthening of the Planning activity will result in improved execution with Quality outcomes.