Well, usually, when you mention the particular time when the action was performed, you should use the Past Simple^ We started the implementation of our project in March 2011 . In order to point out that the project is still underway, you could re-phrase your sentence a little: We have been working on the project since March 2011 .
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vchekhWell, usually, when you mention the particular time when the action was performed, you should use the Past Simple^We started the implementation of our project in March 2011. I agree.
In order to point out that the project is still underway, But the sentence is about the implementation, not th