What is the ideal context for using instructions in an interface?

Using instructions in an interface is most beneficial in scenarios where the actions required are unclear. This means that when users may be uncertain about what steps they need to take, or how to complete a task effectively, providing clear instructions can enhance their understanding and guide their actions. This support can significantly improve the user experience by reducing confusion and empowering users to navigate the interface confidently.

In contrast, while complex processes might benefit from instructions, it's not limited to those situations, as users may also encounter confusion in simpler contexts. Providing instructions in every user experience scenario might overwhelm users and create clutter, detracting from the overall usability. Lastly, restricting instructions only for new users does not account for the varying levels of familiarity users may have; even experienced users can benefit from reminders or clarifications in specific contexts. Therefore, focusing on clarity when actions are unclear is the most effective approach to enhance user interaction with the interface.