 The period of 250 years is applied to the tenth lunar Hijri year (631 CE) until the Minor Occultation (874 CE).According to this book, Mohammad the prophet and the twelve Imams apparently had various methodologies in their lifestyles, but in whole they tried to reach one aim.According to the Tasnim News Agency, Ahl Al-Bayt World Assembly stated that the text has been published for the second time in the United States.