Over the years, project owners and engineering offices have relied on the overall content, risk allocations and philosophical approach of E-500. The 2020 edition remains in line with current standards. In addition, the E-500 2020 agreement contains targeted improvements, more options, better guidance and instructions, and an improved structure. EJCDC E-500 is typically used to hire an engineer for a single specific project. It is designed for the project bid-build design system. In the case of minor revisions, it is suitable for design-negotiate-Build projects and can be easily adapted to assign primary professional services to a large number of other project implementation systems. ..