| Vocabulary | Summary |
| Object system implementation | |
| Capturing and restorating continuations, catching errors | |
| Definition protocol and cross-referencing | |
| Stack effects as first-class data types | |
| Generic word implementation | |
| Low-level in-memory object layout introspection | |
| Factor source code parser | |
| Words are the fundamental units of code |
| Vocabulary | Summary |
| Terminal-based object viewer and editor | |
| View any object as an association mapping slots to values | |
| Multiline string literals | |
| Factor source code prettyprinter |