Answer: Design units and construction units should strictly control design changes. When negotiating design changes, you should pay attention to the following issues: (1) Not raising standards. This mainly means not to change the main equipment and building structure, not to expand the building area, not to improve the construction standards, not to arbitrarily add certain unnecessary project contents, and to avoid exceeding the project budget approved by superiors. If it is really necessary, the application should be submitted to the original approving authority for approval, and then the signature booklet should be submitted to complete the formalities. (2) It will not affect the construction period. Some design changes, due to their late introduction and lack of necessary preparations (such as the preparation of certain necessary materials), may affect the construction schedule and should be avoided as much as possible. If the construction company encounters difficulties during construction, the design changes proposed should generally not affect the delivery date. (3) Do not expand the scope. Design changes should have a scope and should not be included in design changes if they are not part of the design changes. For example, in a project of a certain unit, the length of the steel bar overlap in one of the project details is slightly larger than the size shown in the construction and acceptance specifications. For issues like this, the construction company can raise them at the technical briefing meeting and suggest modifications to the design unit, or they can construct the project according to the drawings and prepare the project budget according to the drawings, without having to treat it as a design change.