I thought I knew the rules of grammar and plunging in Grevisse, I humbly admit that I was off the mark ... Since I acquired this 'small' it never leaves me. The book is clear, well presented, easy search by alphabetical index, the Thematic index and table of contents. There is even, in appendices, changes in the language and recent corrections of spelling. An indispensable reference for lovers of our beautiful language.