Vertical software industry evolution : analysis of telecom operator software The Communication Service Providers (CSP) business is in turmoil. Telecom operators providing communication services constructed the infrastructure of the global information society with their trillion investments on various telecommunication technologies from broadband to mobile. Their investments on software turned their technology specific in house procedures into modern layered OSS BSS. This book analyzes the status and the future evolution of OSS BSS software industry from multiple viewpoints including technology diffusion vertical disintegration and evolution of a vertical software industry. The analysis uses both commercial databases on software market transactions and interviews of operators in Europe and Far East using quantitative and qualitative methods