As services and technologies evolve, the SLA may change to reflect improvements and/or changes. This SLA is reviewed every six months and updated as necessary. If updates are deemed necessary, the customer will be prompted to review and approve the changes. The result that the customer receives through the service provided is at the center of the service level agreement. Any important contract without an associated SLA (reviewed by a lawyer) is likely to be intentionally or accidentally misinterpreted. The SLA protects both parties in the agreement. The measures should reflect only those factors that are under the reasonable control of the service provider. Measurements must also be easy to collect. In addition, both parties should refuse to choose excessive amounts of measurements or measurements that generate large amounts of data. If this happens too often, an SLA can be a key document to confirm communication policies. .