Is diversity good for your business? When answering this question, supporters of diversity point to the growing number of studies that show companies with greater diversity outperform the competition. I see two major reasons why these studies, compelling as they may be, are not moving the needle on diversity.\nFirst, these studies show correlation, which is indicative of two phenomena occurring together, but they cannot show causality --\u00a0i.e., which is the cause and which is the effect. Take gender diversity: The fact that companies with more women in senior executive positions outperform their competition on various key performance indicators can be interpreted in three ways:\n\nHaving more women causes the company to perform better.\nAn additional, unmeasured factor is causing certain companies to have more women and to have better performance; as an example, it could be that geographical regions with better school systems attract better talent that makes companies perform better, while also attracting more women.\u00a0\nA cynic could even argue that companies that happen to perform better \u201ccan afford\u201d to have more women at higher levels.\n\nWhile I firmly believe that the first interpretation is correct, the problem is exactly that it is based on my belief about the underlying causal link. The data cannot be used to support or refute any of these interpretations, and anyone who does not believe in the value of diversity will not be swayed by the data.\nThe second reason is that, even for those who believe in the causal link between diversity and performance, these reports may give a reason why leaders should embrace diversity, but they give no guidance on how to implement the necessary changes. Exactly how many \u201cdiverse\u201d people at what levels do we need? How quickly should we implement these changes? How do we ensure that the people we promote or hire will want to stay?\nThe fundamental problem, then, is that \u201cis diversity good?\u201d is the wrong question to ask. For those who recall the early days of the internet, organizations used to ask a similar question: Is internet advertising a good idea? Today, no respectable CMO would dare to ask that question. Instead, it is taken for granted that, in order to compete effectively, advertisers must make judicious use of multiple channels and formats to reach and engage customers.\nThe analogy between advertising and talent management is worth exploring further. The dawn of digital advertising has had a profound impact on the marketing function, because it gave us the ability to link the behavior of individual ads on specific channels to the overall performance of a campaign. It is for this reason that, in the past decade, the CMO has become a core member of the executive team.\nThe ability to establish a quantitative link between individual assets and overall performance has had a dramatic impact in other areas: financial portfolio management, supply chain optimization and even sports team management have all undergone dramatic transformations in recent decades, precisely because of the emergence of quantitative methodologies that quantify that link.\nFor most companies, human capital is the largest line item in the P&L and the most important asset. Then why is it that companies are able to optimize advertising spend, supply chain, financial portfolios and even inventory and scheduling, but they cannot optimize human capital?\nThe fundamental problem is the lack of a quantitative methodology that can link the characteristics and behaviors of individuals to the overall performance of the company. Today, cost and tenure are the only quantitative measures we have for employees. All other measurement, such as performance reviews and employee satisfaction, are qualitative and usually focus only on a local measurement of performance, meaning that, at best, they are designed to compare individual performance to some ideal (often qualitative) notion of a specific role. With the possible exception of sales people, current methodologies cannot show how the behavior of an individual impacts the performance of a department, let alone the entire company.\nThis brings us full circle to diversity: Without a quantitative methodology, we cannot tell whether a more diverse company will perform better or worse, and we cannot evaluate the right degree of diversity for our company. Asking whether diversity is good is as pointless as asking whether advertising on the Internet is good. Instead we should be asking \u201cwhat is the blend of talent and workplace policies that maximizes the performance of my company?\u201d\nThe good news is that, in the past two decades, agent-based simulation is emerging as a leading technique to capture the behavior of complex systems, with applications in a variety of industries, ranging from marketing analytics to economics. Recently, my colleagues and I have begun to explore the application of agent-based simulation specifically to organizational diversity. In our early results, we were able to show, for example, that simply removing unconscious biases is not sufficient to restore imbalances created by these biases.\nIt is my hope that, ten years from now, talent management will become the single, most strategic function of any executive team. Just as nobody would place all their advertising on TV or all their retirement savings into a single stock, everyone will realize that having mostly white men in executive roles is a really bad idea. Once we have the right mindset and the right tools, people will finally stop asking whether diversity is good for business.