# Model View-Delegate As soon as the amount of data goes beyond the trivial, it is no longer feasible to keep a copy of the data with the presentation. This means that the presentation layer, what is seen by the user, needs to be separated by the data layer, the actual contents. In Qt Quick, data is separated from the presentation through a so called model-view separation. Qt Quick provides a set of premade views in which each data element is the visualization by a delegate. To utilize the system, one must understand these classes and know how to create appropriate delegates to get the right look and feel. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://docs.novaflowos.com/start/qt6-qml-book/readme/ch07-modelview/model-view.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.