Psixik rivojlanish bosqichlari tushunishga yordam beradi: 0-2 yosh - erta bolalik, 3-5 yosh - maktabgacha, 6-12 yosh - mantiqiy tafakkur, 13-18 yosh - o'smirlik davri, 19-40 yosh - professional rivojlanish, 41-65 yosh - ijodiy rollar, 65 yoshdan oshgan - hayot tajribasi