When the Founders finalized the US Constitution they included in Article V the means to Amend the US Constitution to make improvements and to address future needs.
COS Delegates must meet (convene) to prepare the Amendment language which would then need to be approved (ratified) before becoming part of the US Constitution.
In order to convene a COS, either: A) 2/3 (66.6%) of both chambers of the Federal Legislature (Senate and House) must vote YES; or B) 2/3 (66.6%) of both chambers (Senate and Assembly) of ALL State Legislatures must vote YES.
In order for a COS result to be proposed as an Amendment it must be ratified by 3/4 (75%) of the convening Federal or State Legislatures.
Final approval (ratification) of All COS Amendments must be done by 3/4 (75%) of both chambers (Senate and Assembly) of ALL State Legislatures.
Delegates for the COS may be chosen in the manner and quantity determined by the convening group.