NielsenUserControl [principle] v1.0.0

Nielsen Heuristic 3: users often choose system functions by mistake and need clearly marked emergency exits; undo and redo must be supported.

Users often choose system functions by mistake and will need a clearly marked 'emergency exit' to leave the unwanted state without having to go through an extended dialogue. Support undo and redo.

Attributed To

Jakob Nielsen, 1994

Applies To

• destructive actions: delete, archive, bulk operations
• multi-step wizards: back navigation must always be available
• modal dialogs: Escape key and explicit Cancel button required
• text editing: undo/redo history of sufficient depth
• navigation: browser Back button must work predictably
• settings changes: ability to revert to defaults or previous state

Counter Examples

• A 'Delete Account' flow that executes immediately on confirmation with no grace period or recovery email — data loss is irreversible.
• A checkout wizard where clicking Back resets the entire form, forcing users to re-enter all information they already provided.
• A long-running CLI operation with no interrupt mechanism — users must kill the process and restart from scratch.

NielsenUserControl [principle] v1.0.0

Nielsen Heuristic 3: users often choose system functions by mistake and need clearly marked emergency exits; undo and redo must be supported.

Users often choose system functions by mistake and will need a clearly marked 'emergency exit' to leave the unwanted state without having to go through an extended dialogue. Support undo and redo.

Attributed To

Jakob Nielsen, 1994

Applies To

• destructive actions: delete, archive, bulk operations
• multi-step wizards: back navigation must always be available
• modal dialogs: Escape key and explicit Cancel button required
• text editing: undo/redo history of sufficient depth
• navigation: browser Back button must work predictably
• settings changes: ability to revert to defaults or previous state

Counter Examples

• A 'Delete Account' flow that executes immediately on confirmation with no grace period or recovery email — data loss is irreversible.
• A checkout wizard where clicking Back resets the entire form, forcing users to re-enter all information they already provided.
• A long-running CLI operation with no interrupt mechanism — users must kill the process and restart from scratch.

Sources

Examples

• Gmail's 'Undo Send' with a configurable 5–30 second cancellation window gives users a safety net after the most common email regret.
• Notion's Cmd+Z undo works across text edits, block moves, and property changes — users can safely explore without fear.
• VS Code's modal palette (Escape closes instantly) and every dialog having a Cancel button exemplify low-cost escape at every level.

Source

• Jakob Nielsen, 'Heuristic Evaluation', in Nielsen & Mack (eds.), Usability Inspection Methods (1994)
• https://www.nngroup.com/articles/ten-usability-heuristics/