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