What are the different categories of CASE tools?

Computer-Aided Software Engineering (CASE) tools can be categorized into three main types: upper CASE tools, lower CASE tools, and integrated CASE tools. Upper CASE tools focus on the early stages of software development, such as requirements analysis and design, facilitating modeling and documentation. Lower CASE tools assist in the later phases, including coding, testing, and maintenance, often providing automation for these processes. Integrated CASE tools combine functionalities from both upper and lower categories, offering a comprehensive suite for managing the entire software development lifecycle.