Martina Kurth (pictured), published Gartner's Magic Quadrant that "..evaluates the capabilities of end-to-end vendors in the global market for OSS service assurance and fulfillment, a market characterized by simultaneous consolidation and vibrant innovation by startups".
IBM, NetCracker Technology, Oracle, Amdocs and Ericsson are classified by Gartner as "Leaders" (see chart below). HP, who was there last year (here) is now a "Challenger".
"Because of these shifting requirements, we see CSPs worldwide investing in more flexible OSS architectures, which improve the efficiency of service creation, management and timely delivery, and enable them to proactively optimize customers' perceived quality of experience. Simultaneously, CSPs need to keep an eye on opex and capital expenditure (capex). Major OSS investment areas include order-to-fulfillment processes across logical inventory and adjacent product and service catalog domains, order management, configuration management, discovery and reconciliation, and policy management".
See "Magic Quadrant for Operations Support Systems" - here.