Preliminary preparation of the project: I, commencement preparation, II, organization of design disclosure and joint review of drawings, III, management preparation of the project department, single civil works: I, door and window works, II, waterproof works (including external wall waterproof, toilet waterproof and roof waterproof works), III, roof tile works, IV Exterior facade decoration works (including exterior wall insulation, exterior wall coating and exterior wall stone works)