What Is the Conventional Stage of Development?

In developed countries and in many underdeveloped countries, a lot of people fall into the conventional category. Here we have the conformist, the expert and the achiever. Most people don't think that anything beyond the conventional stages is even possible. So this kind creates a sort of false sense of it. You can really get stuck in the conventional area because when 80 % of adults around you are like this, you don't know any better.