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### 5.3 Customize Features

A project, and its targets, are objects using the ‘`EIEIO`’ object system. See EIEIO manual. These objects have data fields containing important information related to your work.

If the high-level functions aren’t enough, you can tweak all user-customizable fields at any time by running the command `customize-project` or `customize-target`. This loads the current project or target into a customization buffer, where you can tweak individual slots. This is usually necessary for complex projects.

Some project modes do not have a project file, but directly read a Makefile or other existing file. Instead of directly editing the object, you can edit the file by typing `C-c . e` (`ede-edit-file-target`). You should “rescan” the project afterwards (see Miscellaneous commands).