Religious School and Sects during era of Imam Ja'afar al-Sadiq (AS)

The days of Abu Abd Allah al-Sadiq, peace be on him, were the days of religious schools, sects, ideas, desires, theology, research, misguidance, suspicion, and doubts. Now, we will mention the origin of those groupings and schools in a brief manner, following the methods that we have adopted in this book because the enlargement upon the research will take us out of the plan of the book, and in the books on the religious schools and sects are many details.