Abstract: A method of simulating end user interaction with a user interface that comprises identifying a user interaction session during which an end user interacts with an application hosted by a client terminal via a user interface which is displayed by the application on a display of the client terminal, iteratively documenting user interface states of the user interface during the user interaction session, the user interface states are tagged to indicate a runtime presentation timing, and iteratively documenting user inputs inputted by the user during the user interaction session, the user inputs are documented with reference to display areas of the user interface at a respective of the user interface states during the user interaction session. The user interface states and the user inputs are time synchronized to generate a simulation of the user inputs during the interaction session with reference to the user interface states in a sequential manner.