When is the marketing feasibility study conducted?

It is usually conducted when attempting to start a new business. Mostly any of the marketing feasibility researchs depend of the 5 key components;

• Stakeholder in depth interview analysis
• Demographic assesment/Trend analysis
• Quantitative Survey
• Competitive assesment
• Demand Model

Different question because all projects needed feasibilty study  let me describe steps for you 

1. Conduct a Preliminary Analysis
2. Prepare a Projected Income Statement
3. Conduct a Market Survey
4. Plan Business Organization and Operations
5. Prepare an Opening Day Balance Sheet
6. Review and Analyze All Data
7. Make "Go/No Go" Decision