1. The document discusses different approaches to classifying services, including seller-related, buyer-related, and service-related methods.
2. Key economists like Eiglier and Langeard, Gronroos, and Shostack contributed conceptual approaches to defining services based on their intangible nature, simultaneous production and consumption, and customer participation.
3. Gronroos developed a model dividing service organizations into visible and invisible parts interacting with customers. Shostack identified four categories to classify services based on tangibility of goods and services provided.