A method to evaluate realizable service quality for delivery of services between a content provider and a user over an IP-based network with a plurality of network segments (2, 3, 4), the method comprising the steps: a. sending, by the user, using a device, an application service request to the content provider; b. initiating, by the content provider, a network capability discovery process on a network-centric evaluation entity for the requested application service; c. requesting, by said network-centric evaluation entity, application service related requirements regarding network performance from a first evaluation entity support entity at the content provider; d. sending, by the first evaluation entity support entity at the content provider, application service related requirements regarding network performance to the evaluation entity; e. requesting, by the evaluation entity, network performance information from second evaluation entity support entities (102, 103, 104) on said network segments (2, 3, 4); sending, by the second evaluation entity support entities (102, 103, 104) of said network segments (2, 3, 4), available network performance information on available network capability on said network segments (2, 3, 4) from evaluation entity support entities (102, 103, 104) in said network segments (2, 3, 4) to said evaluation entity; f. comparing, by said network-centric evaluation entity the received available network performance information with the application service related requirements on network performance, which results in information whether the requested application service can be provided in the requested quality; g. sending, by said network-centric evaluation entity, the information whether the requested application service can be provided in the requested quality to the first evaluation entity support entity at the content provider; and h. sending, by the content provider, a forecast service quality indication feedback based on the information whether the requested application service can be provided in the requested quality to the device to inform the user in advance whether the requested application service is realizable in the user requested quality, i. wherein in case the forecasted service quality indication feedback does not fit the user expectations, the user is able to request the service in reduced quality or to buy more network performance. a. sending, by the user, using a device, an application service request to the content provider; b. initiating, by the content provider, a network capability discovery process on a network-centric evaluation entity for the requested application service; c. requesting, by said network-centric evaluation entity, application service related requirements regarding network performance from a first evaluation entity support entity at the content provider; d. sending, by the first evaluation entity support entity at the content provider, application service related requirements regarding network performance to the evaluation entity; e. requesting, by the evaluation entity, network performance information from second evaluation entity support entities (102, 103, 104) on said network segments (2, 3, 4); sending, by the second evaluation entity support entities (102, 103, 104) of said network segments (2, 3, 4), available network performance information on available network capability on said network segments (2, 3, 4) from evaluation entity support entities (102, 103, 104) in said network segments (2, 3, 4) to said evaluation entity; f. comparing, by said network-centric evaluation entity the received available network performance information with the application service related requirements on network performance, which results in information whether the requested application service can be provided in the requested quality; g. sending, by said network-centric evaluation entity, the information whether the requested application service can be provided in the requested quality to the first evaluation entity support entity at the content provider; and h. sending, by the content provider, a forecast service quality indication feedback based on the information whether the requested application service can be provided in the requested quality to the device to inform the user in advance whether the requested application service is realizable in the user requested quality, i. wherein in case the forecasted service quality indication feedback does not fit the user expectations, the user is able to request the service in reduced quality or to buy more network performance.