ind us about the characteristics of old telecom- munication networks, which were mainly single-service networks. Not having very much to worry or say about the only existing and successful service, the focus was set on how to satisfy or provide it, in the best way. New reasons refer to the close relationship that can be found between new network tech- nologies (enablers) and new customer services. Frequently enablers open new possibilities Understanding Changing Telecommunications - Building a Successful Telecom Business on service provisioning and can force a dramatic turn around on telecom business. How- ever, this does not always happen, on the contrary many promising technologies are frequently not able to produce any substantial change on the service menus or service provisioning characteristics and even to cause any attraction for end users. 4.5.4 TOOL: SIMPLIFIED BUSINESS CASE WORK MODEL This model can be regarded as a sub-tool or a variant of the first one, dealing with all type of investments. See Figure 4.34. 4.5.5 TOOL: A COMPUTER PROGRAM BUILT ON THE BUSINESS MODEL The present transformation of telecom networks has a wide-ranging impact. To be able to perform a corresponding business case with all its changing parameters computer programs are developed. The program referred to below is one of the programs developed at Ericsson to support calculations of the impact of the transformation process. Some main goals of this computer program are: To demonstrate cash flows as a result of increased and new end-user service revenues for the operator. To show the revenue distribution over the value chain and how the operator is positioned to maximize opportunities. To show revenue streams for each market segment per end-user service that is offered. Link revenue to capital investment and operating cost for a total business case. It is up to the user to assess how suitable the tool is for the business case that is being considered. The tool is quite comprehensive in order to suit many cases. Some examples are: id