This morning I received a question about how the present perfect tense works in English:

Is the following sentence correct in terms of grammar ‘Yet ongoing political stabilization has been beneficial for further political and legal development of the country’? I am a little bit embarrassed by the use of present perfect tense for the event which has not been completed yet but is progressing, so it is impossible so far to predict for sure an outcome of it.

Here is my reply.

The “has been” refers not to the state of completion of the stabilization, nor even that the benefits are already palpable and therefore contain some complete benefits. The use of this tense is predicated by the fact that we are still in the time period the writer has in mind. It does not really equate to perfective aspect, but to cut-off or periodization of times.

This is the difference between tense and aspect, in a nutshell.
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