Zaydis, Isma'ilis and Sunni-Chi'i ecumenicism:

• Zaydis consider Zayd a Caliph, a son of Zin el Abidin, different one from the recognized by the twelvers. They recognize Abu Baker and Umar, and their imam should be a descendant of Ali and Fatima. Also, they follow the Sunni Hanafi school.
• Isma'ilis consider Ismail's designation valid. The rebellion started in Iraq and Syria.They have even taken out the Black stone out of the Kaaba at some point. The Fatimid movement started in Ninth Africa and took Egypt as a capital. they were strong economically and military. This have produced two groups: Mustalis and tayibis. In the 19th century, they were called Suffi Tariqa, Aga Khan being the leader. The special thing about this group is the extent to which they take Taqqia. 
• Although the Sunni and Chi'i lived in conflict for a long time, there has been a rapprochement when Al Azhar recognized Al Ja'fari to be a valid school. the conference allowed to recognize all the other groups as true muslims. The relation between the two groups incorporates both cooperation and conflict, In Iraq case for instance. 

Further information: 

• Zaydis are estimated to constitute 8 million of the some 70 million Shi'ite population of the world.
• The distinctions between Zaydism and Twelver Shi’a belief mean that Zaydis do not fall under the religious patronage of Iran, nor do they have the same cultural and spiritual links as some Shi’a communities elsewhere, in Lebanon for example
• The University of al-Azhar and the Academy of Science, Dar al-Ilm, in Egypt and indeed the city of Cairo itself is constructed by the Ismalis
• The Ismaili Muslims are a culturally diverse community living in over 25 countries around the world. They adhere to a 1,400 year tradition of Shi'a values
• Ismaili and Sunni both have different kalma or difference in the verses of Quran such as ismailis having an extra verse added beyond what Shias recite.
• Sunni and Ismaili Muslims have major differences in their prayer and other rituals.