Which action occurs first when navigating to a screen?

When navigating to a screen in OutSystems, the first action that takes place is running the Preparation. This phase is crucial because it serves to gather and prepare all the necessary data needed for the screen before it gets rendered to the user. During the Preparation phase, any logic, data retrieval, or initialization that needs to happen before the user sees the screen is executed, ensuring that the interface has all the relevant information it requires to function properly.

Following the Preparation phase, the Rendering of the screen occurs, where the user interface is built and displayed based on the collected data and defined layout. Thus, it’s clear that running the Preparation must happen first to set the stage for successful rendering of the screen to the user.

The other options involve actions that follow the Preparation. The Screen Action is executed after the screen is rendered, and the On Click event occurs in response to user interaction, which happens after the screen is already displayed. Therefore, these actions are contingent upon the successful completion of the Preparation phase.