The Development of Psychological Indexes for Product Design and the Concepts for Product Phases

WITH FAST‐PACED CHANGE as the context for product development, managers and designers keep close tabs on technological life cycles. As Ding‐Bang Luh points out, however, they also need to keep an eye on perceptual life cycles. He identifies four phases in the perceptual life of a product, and describes how consumer understanding and use of a product changes as it moves through this cycle. Knowing where products stand in this sequence is an asset that permits organizations to use their design resources effectively and efficiently