摘要：Consumers still ask new and new products; therefore permanent development of new products and presenting them on the market is inevitable in the competitive surroundings. It finally means realising product innovation and at the same time changes in all production components, in production system, in operation of the whole business system. The effort of the firms is to approach to the modification improvement or product innovation (adaptation) according to market conditions. Modification, innovation, adaptation, product improvement influence their life cycle and so the product gets into life cycle in spiral form.
