How to balance user freedom and requirements when filling out forms

1. What is user control and freedom?
2. What is flexibility and efficiency of use?
3. What is consistency and standards?
4. What is a user control?

What is user control and freedom?

Jakob Nielsen's third usability heuristic for user interface design is user control and freedom. This principle states: 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.

What is flexibility and efficiency of use?

A flexible and efficient system isn't just about helping users transition from novice to expert use, it's also about allowing users to approach tasks in multiple ways to suit their working style. This can be as simple as structuring functionality in an open-ended rather than a prescriptive way.

What is consistency and standards?

"Consistency and standards" is a principle that identifies the need for language, icons, symbolism and all other recurring elements within user interfaces to remain the same across different tasks.

What is a user control?

User controls are containers into which you can put markup and Web server controls. You can then treat the user control as a unit and define properties and methods for it. Custom controls. A custom control is a class that you write that derives from Control or WebControl.