按部就班;按照计划进行
Something that happens according to plan happens in the way it was intended to.
Did it all go according to plan? 一切都是按计划进行的吗？
If everything goes according to plan, the building work will be finished by summer.
Officials said the entire event had gone according to plan.
The journey went according to plan and we arrived before eight.
It wasn't a surprise - that was all according to plan.
See also: according to (METHOD)