I am tidying up my flat and recovered a copy of my 1988 paper developed for Oracle Expo Europe of that year, called Developments in the UK Case Market. It looked at SSADM vs Information Engineering and how and why to implement these methodologies. It’s not as dated in content as one might think, although the language is a bit old fashioned. Obviously if using post relational design and implementation techniques some of it is a bit old hat but not having a data model will be a cause of regret.
A bit of an old hat