Germany's "National Beer Day" comes round again on April 23. This year something very special is brewing: 2016 marks the 500th jubilee of the world's oldest food law. In 1516, the Bavarian co-rulers Duke Wilhelm IV and Ludwig X issued a decree in Ingolstadt to the effect that henceforth, only barley, hops and water could be used in the brewing of beer. The "Reinheitsgebot" was born, and its fame has since spread around the world. German beer is one of the country's most popular exports, with around 1.5 billion liters shipped to foreign shores every year. A high proportion of brewers rely on technology from Siemens to prevent any disruptions to production and keep the golden liquid flowing freely. Since the end of the 19th century, the company has been involved in all aspects of beer brewing. The first electronic control-based automation solutions came into existence in the 1970s. The "Braumat" process control system has since taken care of reliable production and quality consistency in countless breweries the world over. Today, competition for market share in the beer industry is tough. Efficiency and flexibility are vital to success. What remains to be seen: What will the brewery of the future