b) Changes and advancement in technology; and, c) Compatibility with agreements, standards and recommendations by the International Telecommunication Union. 2) When proposing National Numbering Plan amendments, the Authority shall conduct a Regulatory Impact Analysis (RIA) that includes, but not limited to, the following factors: a) The material impact caused by the amendment to the sector and to the Licensees; b) The advantages to End Users in not changing the Numbers through which services are provided; c) The undue impact to End Users who are using the numbers already; d) The benefits and costs of a change to the National Numbering Plan; and, e) The costs of alternatives to a change to the National Numbering Plan that provide similar benefits. 10. Scope of Amendments to the National Numbering Plan 1) In amending the National Numbering Plan, the Authority shall do only some or all of the following: a) Change the Allocation Status; b) Change the Usage Conditions; and, c) Change Numbers by replacing, inserting, or deleting digits. 2) The creation of Assignments, the return of Blocks and the withdrawal of Blocks are not amendments to the National Numbering Plan but are changes in the Allocation Status of Blocks that are maintained and published in the National Numbering Plan. 11. Timing of Amendments to the National Numbering Plan If the Authority amends the National Numbering Plan by replacing, inserting or deleting digits in Numbers: 1) The Authority shall ensure that advertising or advisory material, explaining the practical consequences of the amendment to customers, is made publicly available at least six (6) months before the modification occurs; 2) The Authority shall inform Licensees about the amendment at least two (2) years before the amendment occurs; and, 3) The Authority shall inform the International Telecommunication Union and any necessary foreign telecommunication administrations about the amendment at least two (2) years before the modification occurs. 12. Implementation of Amendments Every Licensee shall implement an amendment to the National Numbering Plan at the time and in the manner that the Authority determines for the Licensee. PART FOUR UTILIZATION OF NUMBERS 13. Monitoring Utilizations of Numbers 1) Every Licensee shall at the end of each year submit to the Authority information 4