Purpose: The opportunity assessment should be made early before the project is initiated. The purpose is to validate that the idea or product is worthwhile pursuing. The content can be ref 

• What is the problem
• Who is the target group
• Market size  /  number of business units/users (if internal)
• Alternatives
• Differentiators
• Market window
• Success factors
• Assumptions

The opportunity assessment is an important part of a business case with a specific focus on the product

Key activities

• Define format
• Collect input
• Evaluate alternatives
• Present opportunity assessment

Make go / no-go decision