If your company is thinking about hiring an outside firm for SEO, please read this post. If you work for one of the many reputable SEO agencies in the market, please have your prospective clients read this post.
How good is your SEO agency? If you're like most CMOs I speak with these days, you won't be able to honestly answer that question without relying overtly on your intuition. Hopefully this article can allow you to answer this haunting question with a bit more certainty.