1. Value: Is the product valuable? Will people buy it or choose to use it if it's free?

2. Usability: Can users understand how to use the product? This aspect emphasizes the importance of good product design.

3. Feasibility: Can the product be built with the current team, technology, and within the necessary timeframe? This includes considerations for advanced technologies like machine learning.

4. Viability: Can this product sustain a business? This involves legal, financial, and market accessibility considerations, including regulatory compliance.

The Product Manager is responsible for the value and viability risks, and overall accountable for the product’s outcomes.

The Product Designer is responsible for the usability risk, and overall accountable for the product’s experience – every interaction our users and customers have with our product.

The Product Lead Engineer is responsible for the feasibility risk, and overall accountable for the product’s delivery.