Luis Cazares (8/3/2015)
I'm assuming that Style, Article and Size are independent from each other and you can have the same size within different articles and styles.
That's just the thing...these 3 attributes are not independent of each other. From my experience in retail environments, an article is defined by the style, size and the sometimes season and fabric as well (if it is clothing). IMO option 2 would not make sense in that case, because you would still need to include style and size attributes in the article dimension.