1. Idea generation: The first stage of new product development involves generating ideas for new products or services. This can be done through brainstorming sessions, customer feedback, market research, or other methods.

2. Idea screening: Once a list of potential product ideas has been generated, the next step is to screen and evaluate these ideas based on factors such as feasibility, market demand, and profitability.

3. Concept development: After a product idea has been screened and selected, the next stage involves developing a concept for the product. This may involve creating a product prototype, defining the product features and specifications, and testing the concept with potential customers.

4. Product development: Once the product concept has been validated, the next stage involves developing the actual product or service. This may involve design and engineering work, creating a production plan, and testing and refining the product.

5. Test marketing: Before launching the product, companies may conduct test marketing to assess customer response and gather feedback.

6. Launch: Once the product has been developed and tested, it can be launched into the market. This involves creating a marketing plan, establishing pricing and distribution strategies, and promoting the product to potential customers.

7. Post-launch evaluation: After the product has been launched, it is important to evaluate its performance and gather feedback from customers. This can help inform future product development efforts and identify areas for improvement.