Linked from
The 22 pages that link to Sufi orders, each with the reason it gives.
SufismBroader topic: Orders preserve methods of training and collective devotional life.
SamaNarrower topic: Different orders preserve distinct forms and rules for sama.
QadiriyyaNarrower topic: The Qadiriyya is one enduring example of this institutional form.
SilsilaNarrower topic: A silsila connects individual teachers within an order’s broader structure.