Both of these examples of grid layout case studies I found in Glamour magazine.
In the first example above, the grid layout used helps to provide consistency in the article by keeping the flow of the text easy to understand. The use of the orange stroked boxes on both pages, helps to signify a separate part of text or information within the grid layout itself, and helps in making it easy to understand and follow; as well as adding variety and colour.
On both pages, the text is divided up into two columns on the grid, and on the first page it also is divided into a few rows also (the heading, the first block of text and the second block of text in the orange lined box.) By using these rows and columns, and defining change in content information by adding the thick orange stroke to the boxes, really helps to keep structure to the design while being easy to read and aesthetically interesting.
In this design, the grid has been broken in a couple of ways. Firstly is the use of photographs to help add information to the article, and secondly is the placement of the yellow information boxes rotated at slight angles. Without using the images to break up the text, the article would look very boring, and may note provoke many people to want to read it. However, by inserting them in different places within the grid layout and wrapping the text around the photographs, it therefore "breaks the grid" and works effectively in creating something more interesting to look at.
The bright coloured boxes contain short points of information work in the same way. Their colouring makes them stand out, and the slight change in angle helps break away from the very straight and rigid structure the grid provides for the rest of the layout.
This second example is quite simple yet still effective. The main body of the grid used here consists of two columns both containing text. This simple grid layout keeps structure to the article and makes it easy to read and follow. In regards to breaking the grid in this instance, the text in the centre of the article has been placed there and enlarged to add change and variety to the piece. By doing this, it draws your eyes to the piece of writing - obviously seen as one of the key quotes the writers and editors want you to read. This simple example of "breaking the grid" with the text wrapped around it, definitely adds interest to the article's layout and makes it far more interesting to look at then if it were just two simple columns of solid text.