The dilemma of navigation style is about what is the best way for the operators to access a feature, in the various operational situations.

Navigation styles

• Direct access is best for control features that the operators need to access frequently. 
• Guided access is best for features that the operators need to access rarely, when they are not familiar with the access point, and guidance is required.
• Searching is required for cases when the operators do not know or do not recall the access point.

Considerations

The navigation style should be chosen according to various considerations, including: Human factors, Workload, Design goals, Situation dependent ..., Information dynamics