cost control in the project

Thanks Mounir for the specification, in the PMI definition Initiating, Planning, Execution, Closing are 4 of 5 process groups.
As commented in my previous post I was relating an article by Elizabeth Harrin. I cited directly her definition and maintained it for coherence. I understand she didn't made a direct correlation with PMI definition but used the word as synonymous of time, moment etc.
Please note she was citing other article:

"In Project-Driven Creation, Jo Bos, Ernst Harting and Marlet Hesslelink talk about 4 instruments for cost control – and by ‘instruments’ they mean tools.

They describe 4 different tools that you can use as your project progresses.

In the Initiation Phase, use cost estimates.
In the Planning Phase (which they call Definition), use a budget.
In the Execution phase, use cost monitoring.
In the Closing phase, use financial evaluation."

Perhaps she maintained the definition for coherence too, I don't know.
In any case, for more precision, I think we have to read the word "phase" as synonyms of "time" or moment

thanks Mounir,
I'm in the construction field. when i have to preapre the construction budget i focus my attention in the most important items which represents around 90% of budget value, in this case the effort is done for having very detailed estimate . Other items (e.g. furniture, cabinet works) in this phase are evaluated only high level due to they are items that normally you have to purchase at the end of the construction process (after 1 - 1,5 years) and cost could be change or products could be not in market anymore.
I agree with your comment
Thanks
Fosco

correct Rami, this is the correct process. In my case, due to I normally use a fixed price contract for general contractor (like you I'm in civil construction field). For this reason the process you describe is not applied to general contractor (after contract signature off course) but more effectively for minor items (furniture, wood finishes etc.) and change order for contingency not included in the general contractor contract. Concerning minor Items I think is better to have an high level estimate at the beginning which you can improve when it is necessary (these items normally are necessary 1 - 1,5 years after construction start - and costs can change in the meantime or some of them are not in production anymore)

Glad to know we are in the same field. In case of FP Contracts, we usually estimate and prepare a budget before sending out tenders for bidding. When you have FFP, I agree its difficult to do savings and sometimes changes are huge but usually we use FP with Incentive.

thanks for the note Mounir, I would specify better the matter in my first post.
I think now is clearer

thanks