The discussion started around March 2017 when Alex Beregszaszi (@axic) proposed Meta EIP 233: Formal process of hard forks to describe the formal process of preparing and activating hard forks.
In Dec 2018, Afri Schoedon proposed to write an EEP to define the Ethereum Network Upgrade Process. EEP-5 primarily covers Ethereum 1.0 upgrades. It suggested moving from ad-hoc hardforking to fixed-schedule and provides a general outline process with all required stages of hardforking. It was also pre-announced and requested for collaboration at Eth Magician then.
Based on the recent discussions in ECH meeting #8 and ECH meeting #9,a formal process of selection of EIPs for hardforks (Meta EIP#) is proposed #1929.
The ultimate goal is to have well defined process which every EIP author may follow in order to add EIP in next upgrade.