Understanding Ada Lovelace and Lillian Gilbreth is important to the history of IXD because they laid the foundations of computer science and human-computer interaction, respectively, and the intersection of these fields has directly influenced the development of modern interaction design, bringing technology and user experience closer together. Ada Lovelace laid the technical foundation for computer interaction and proposed the concept of simple machines, making computers not just computing tools, but devices that can carry out multiple interactions. Lillian Gilbreth emphasized user experience and human factor engineering, pushing interaction design toward more consistent with human cognition and behavior. The influence of these two women laid the foundation for interaction design as a discipline that combines technology and the humanities.