This document discusses approaches to product design and modification, including techniques like value engineering, quality function deployment, and concurrent engineering. It covers elements of product design such as research and development, modular design, and computer-aided design. The document also addresses issues in product design like legal, ethical, and environmental concerns. Sources of product ideas can come from internal research or external sources like customers and competitors. Strategies for modifying existing products include researching customer needs, making minor changes to increase profitability, and using brand extension.