请用忠实准确的英语翻译以下内容。612项目时间变更 1顾客里程碑的变更：若是顾客提出并经项目组论证可以实现组长重新编写《项目开发计划-进度表》并通知有关部门、人员各部门根据新的计划变更各自的工作计划。若是公司内部提出变更需要顾客代表通知顾客获得同意后项目组长新编写《项目开发计划-进度表》召开项目组会议告知新的《项目开发计划-进度表》各部门根据新的计划变更各自的工作计划。 2内部里程碑变

6.1.2 Project Time Change (1) Customer Milestone Change: If the customer proposes a change and the project team demonstrates that it can be achieved, the team leader will rewrite the "Project Development Plan - Schedule" and notify the relevant departments and personnel. Each department will adjust their work plans according to the new plan. If the change is proposed internally by the company, the customer representative needs to notify the customer and obtain their approval. After that, the project team leader will rewrite the "Project Development Plan - Schedule" and hold a project team meeting to inform everyone about the new plan. Each department will then modify their work plans accordingly. (2) Internal Milestone Change: The project team leader will coordinate the work of each department according to the "Situation Escalation Control Specification" to ensure that the customer milestones are not affected