I am trying to set my mind on the PMI rails, but absolutely can't get the order in which a project manager asked to prepare a project charter prior to steps in the planning process group like collecting requirements, defining a scope and estimating costs.
I understand that in a project charter it is only necessary to give a high-level outline of a project, not going too deep into details. But reality and past experience say that once I will write somewhere a budget $10000 and delivery time 1 month, they will stay as that, even though, a calculator feature, defined in the project charter, in a scope statement will appear as a calculator with artificial intelligence that explains why 2+2 is 4, - interactively, with illustrations.
Where am I going wrong? Should I really start defining a project from the project charter rather than planning stage?