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2.0. Conclusion  

As final conclusion the "Quality of Service" premise can be summarized in a simple question: 
How to get and how to offer better services in Internet? 
The question could be answered with some useful guidelines to be followed:
  Users and customers have to be more demanding in the kind of service they receive. They should demand quality. 100% availability, bandwidth adherence to the signed contracts, low latency, low jittery and low losses. Arrangements promised some type of service and customers are paying for it; nothing less. This way ISPs will be forced to improve their installations, and to take into account the tiny details required to lend the best service. Also, monitoring and measurement devices must be provided by ISPs to users, for them to be sure that they are really receiving the desired QoS level, and in case of not, they can find the responsible ISP, if there are multiple ISPs involved in providing the service.
ISPs have to abandon the convenient approach to endorse the infamous "best effort" policy. Because "best effort" really means not effort at all. ISPs should pay attention to the "Quality of Service" problem. They have to study and invest time researching about QoS problems and tools available to deal with them. They have to listen to their customers, and when claims imply a QoS problem, measures must be taken and responsibility must be well established. Each involved ISP must use the test data obtained to redesign and optimize its own network.
Following these guidelines is the only way to have, all of us, the quality of service new business model and applications are demanding from Internet.