Assuming that I have understood your question, language change is not a matter of argumentation or truth, but a FACT. Languages do change in a rather undramatic, invisible fashion. Dropping one's language in favor of another is not because one's language is one of the "best." This sounds like a contradiction for me. The reason behind this is to meet the needs of technological development. The three most important languages in terms number of speakers, namely, Chinese, English, and Spanish, are self-sufficient right now because they are coupled with scientific and technological import. During the colonization of North Africa, the Arabic dialects of those countries changed, for instance, by borrowing and naturalizing the mechanics jargon into their dialects.

Dear Prof Zouheir Maalej

I agree with you

But in some countries it is just a change only to spend public opinion

Suppose the language of instruction has been changed to one of these languages ​​mentioned in your answer. Is choosing one of these languages ​​a guarantee of success?

Either the system as a whole must be changed because in our country we want to change the language without changing anything with it, and what I see is just a formal change.

thank you

best regards sir

I think the way language changes has nothing to do with the official language. What language is used a political issue: USA influence on the world economy has an impact on what languages are used for international relations and, by extension, on science.

Dear prof Rodrigo costa dos santos

I know that, but I am talking about countries that do not have a political will and are not originally prepared to keep pace with development. Change the language is something formal only because whoever wants development does not have to create reasons if we talk about their economic components and the weakness of the country’s character. I mean, I want to come up with a conclusion that indicates these countries However, changing a language is not a magic key to development, but rather a way to solve a communication problem

I agree with you, Zouaoui. Access to the "language of science" in itself does not translate into scientific development. It needs to be coupled with an investment in scientific research.