One of the last places I worked at had a delegation engine in SharePoint, a SharePoint List that specified the SharePoint groups that would be sought for approval for a workflow based on that workflows code. Anybody in that SharePoint Group could approve the task and then the workflow would proceed to the next specified group in the delegation engine.
I'm now working elsewhere, and I want to build a similar system - but I've no idea what this kind of a delegations system is called or how to research it. How can something like this be done? I have access to SharePoint 2013 and Nintex Workflows Enterprise, if that helps.