A Deep Mixing Method (hereafter, WILL Method) has received an inspection certificate for construction technology. In May 2013, the WILL Method, which uses a backhoe type vehicle with a revolving mixer to shake and mix a slurry of solidification and improvement materials, received an inspection certificate for construction technology (Certificate No.1301 in construction machinery and execution technology) from the Japan Construction Machinery and Construction Association. Its distinguished technology for ground improvement was thereby recognized.