What are the Advantages and disadvantages of storyboard?

A Storyboard enables designers and producers to pre-visualise their work before commencement.

Advantages:
- for a website the developer is able to check that all navigational links are correct
- a overall picture of what the website will looklike which enables the developer to improve the quality by identifying and flaws or faults in the design
- it allows for the best possible design to be reached by constantly overviewing the overall picture

Disadvantages:
- bum.