In a recent commentary in Nature Reviews Molecular Cell Biology, @Odedrechavi & Pavel Tomancak present some ideas on how to credit the work of co-authors on publications - essentially how to figure who did what, now that it is not unheard to see papers with three or more joint first authors (and senior authors as well).
https://www.nature.com/articles/s41580-023-00587-x

The issue matters, of course, for research assessment and career progression. Bernd Pulverer and Thomas Lemberger discussed some alternatives beyond simple authorial credit, making use of emerging #OpenScience tools. You can listen to our conversation at the link below.
#EMBOPodcast

https://www.embo.org/podcasts/a-steppingstone-to-an-open-science-future-embo-press-moves-to-full-open-access/