Market mix modelling, econometrics – call it what you will – but it’s “flavour of the month … although we don’t really know what it is” as one CMO put it at an Mi3 Roundtable unpacking the surge in interest, take-up and growing confusion with new vendors, models and transparency standards. The MMM maturity curve is spread wide and this roundtable reflected the market – for some, their pre-Covid deployments are humming with ROI improvements tracking in healthy double digits thanks to some hard yards bringing sales, product and finance on board. At the other end are marketing and customer leaders who “haven’t landed anything that’s given us confidence so far” or were still facing hard resistance on the the merits of MMM. But across the piste, there's consensus for a regime that allows transparent comparable testing standards of MMM vendors and models on their outputs. To ensure candour, the conversation was conducted under Chatham House Rule, bar the co-founder and head of data science at Mutinex, Henry Innis and Peter Photinos, who addressed the swathe of intrigue, frustration and challenges brands are facing in the current MMM wave. Here’s a fast tour through the debate.