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There will be different scenarios coming across during a project life cycle where you need to take decisions and go ahead with the project. There are some globally recognized way of doing things in project management. Is it very important to follow the rules or is it reasonable to break the rules in some situations
It's not rule of thumb to use every process recommended by PMI in every project. Project Manager can tailor the required processes based on the nature of the project..
as long as it is ethical and is in alignment of project objectives the orgaisation is free to frame their own rule
References like PMI & Prince2 are a complete methodologies, you can customize what you need from them according to your project needs, size and environment. but if you are talking about your internal organization rules, it is not recommended to break the rules without a proven justification.
