Commercial alloys are composed of many elements. To develop these alloys and understand their properties, we are developing high-throughput methods to efficiently obtain phase diagrams and property maps for multi-component alloys. The three fundamental elements of this method are as follows. ① By introducing gradients in composition and heat treatment temperature within a single test specimen, we create and use an aggregate of microspecimens with varying compositions and heat treatment temperatures. ② Properties are measured in each micro-region. (This includes the development of measurement methods.) ③ During measurement, we apply the automated measurement and analysis system we have developed. Employing our newly developed high-throughput method, we succeeded in comprehensively acquiring big data at an incredible efficiency—more than 100 times that of conventional methods.