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According to Forrester Research, over 150bn emails will be sent to consumers by retailers and wholesalers this year.

And many will be received by recipients who don't really want them.

The days of deploying your site changes to production without first testing functionality and cosmetics are long gone. 

So too will the days of deploying website changes that are not conversion tested. 

Here, we speak to Lovefilm's digital and usability product manager Craig Sullivan about the work the DVD rental company has been doing in multi-variate testing (MVT).

Craig is a bit of an evangelist on MVT - a hot topic right now - and has some great insights into when and how best to use it, the differences with A/B testing and how to intepret results. 

We're seeing growing interest from site owners in doing A/B split testing and multivariate / multivariable testing - for landing pages, for product pages, for buying processes, for e-mails and so on.

But who are the service providers out there specialising in offering such solutions?