I have been doing SEO since the early days of Alta-Vista. And over the years, SEO has changed a lot. One thing I have learned during this time is SEO is a bit of an art, but still measurable. With the array of tools available to web masters, it isx.I have been doing SEO since the early days of Alta-Vista. And over the years, SEO has changed a lot. One thing I have learned during this time is SEO is a bit of an art, but still measurable. With the array of tools available to web masters, it isx.