This paper provides an overview of the development of Knowledge Engineering (KE) over the past 15 years, focusing on the paradigm shift from a transfer view to a modeling view. It discusses two significant approaches: Role-limiting Methods (RLM) and Generic Tasks (GT). The paper describes three modeling frameworks—CommonKADS, MIKE, and PROTEGE-II—and highlights methodological developments such as specification languages for knowledge-based systems, problem-solving methods, and ontologies. The relationship between KE and other disciplines like Software Engineering, Information Integration, and Knowledge Management is also explored. The introduction explains the historical roots of KE, emphasizing the transition from a transfer process to a modeling process. The paper then delves into specific approaches like RLM and GT, detailing their structures and applications. It concludes by discussing current developments in KE and their connections to related fields.This paper provides an overview of the development of Knowledge Engineering (KE) over the past 15 years, focusing on the paradigm shift from a transfer view to a modeling view. It discusses two significant approaches: Role-limiting Methods (RLM) and Generic Tasks (GT). The paper describes three modeling frameworks—CommonKADS, MIKE, and PROTEGE-II—and highlights methodological developments such as specification languages for knowledge-based systems, problem-solving methods, and ontologies. The relationship between KE and other disciplines like Software Engineering, Information Integration, and Knowledge Management is also explored. The introduction explains the historical roots of KE, emphasizing the transition from a transfer process to a modeling process. The paper then delves into specific approaches like RLM and GT, detailing their structures and applications. It concludes by discussing current developments in KE and their connections to related fields.