Planning refers to preparing a job so you can do that job without unnecessary delays.
A plan may or may not have dates associated to it. A plan is about what are supposed to happen, who is in charge of implementation, how much the task/project costs.
Planning是指为了避免任务不必要的逾期而提前做的准备计划。这个计划可能没有具体的时间安排，因为Planning关注的是做什么以及怎么做。
Scheduling focuses on when job will get done and who will do it, which is when a plan is assigned confirmed dates to the tasks.
The schedule is typically represented in a calendar, so scheduling is setting up a date and time for something to happen.
When you schedule something, you will also assign who should take actions to that task(s). Because you can't know the exact deadline without confirmed resources (people)
Scheduling关注的是计划的具体执行过程时间安排以及具体的执行人安排。Scheduling通常对应着工作日历中的待办事项。
In general, planning defines WHAT and HOW, while scheduling defines WHEN and WHO.
Both planning and scheduling are important and necessary to make sure task/project successful.
Planning should always be done before scheduling.
The plan is not too much valuable, the real value is in the planning process.
Planning与Scheduling都是保证任务顺利完成的基础。Planning应该在Scheduling之前完成。没有Planning则不可能有科学的Scheduling。
Plan本身价值不大，真正的价值体现在Plan的过程Planning中。
