Only if the book is closed it is one page, isn't it ?

I consider understanding how to use a grid very important to graphic design education. Maybe I'm old school, but I believe you must understand the rules in order to understand how to break them.

I see you've posted this same question 4 times in different areas. You will never have good, fluid conversation by doing this.

I agree Miss Tiffany. But I don't think it is old school.
@ N-Jay-G: Have a look at this website: http://www.markboulton.co.uk/journal/comments/simple_steps_to_designing_...

We all design for an audience. We should at least.
In normal circumstances you want to aid the reader in reading the text.
By giving this text (and other content) in small readible chuncks, you will help the reader.

Using a grid does the same. A well designed grid will present the content in a pleasant way and also presents a structure, an order in that content. This troughout a complete book or magazine.

But even when you are designing a flyer, your design could benefit from a well designed grid since a well designed grid is also a pleasant grid.

It is up to you to design a grid which will be true for your design style.

Extremely.

I wish this site was around when I was in school - http://www.thegridsystem.org/

"If you hit a wrong note, it’s the next note that you play that makes it good or bad" - Miles Davis

Yes.

But, grids themselves and how you use them are 2 different things, and both are important. I think most of the time the grid should be invisible to the viewer, but it can be used in a more dominant way to great effect too.

In the 90's grid-based design had a bit of a falling out thanks to David Carson, and the hordes of imitators, but thankfully grids, simplicity and logic are, and have been, making a comeback.

Grid systems and use of them are an essential part of design education. However, it should carry a small role in comparison to concept development. The message being communicated often decides the value of the final piece.