Grade A engineering consulting units can undertake economic construction consulting of industries or regions, and also undertake engineering consulting business of large, medium and small capital construction projects or technical transformation projects. Class B engineering consulting units can undertake professional or urban planning consulting and engineering consulting services for small and medium-sized capital construction projects or technical transformation projects in their own specialty or region. Class C engineering consulting units can undertake engineering consulting business of small capital construction projects or technical transformation projects within the approved scope.