If it is the interventions in congresses (conferences or oral communications / or posters). Their abstracts are initially judged by the scientific committees of the congresses which after their examination decide to accept them or not.
Their texts is subsequently published in the proceedings of the Congress after their analysis or not by the reviewers according to the requirements of each Congress.
Some congresses reserve special issues of certain indexed and impacted scientific journals for the publication of relevant conferences and communications after their acceptance by the reviewers.
Thanks for your answer. Indeed special issues of certain indexed and impacted scientific journals for the publication of relevant conferences and communications after their acceptance by the reviewers is important factor.
Indexing & associated journals for publishing can be pre-conference worth evaluation. I also score the conference wroth by:
Did I manage to present in the conference & did my article being published as conference proceeding and / or journal article (usually for the latter is free of charge if the article is down selected)?
How many new ideas (or ideas that I never thought of) I received from the Q&A / clarifications on my presentation / article?
Did i learn something new from the conference e.g. other research subjects / topics of interest?
Did I manage to network with other researchers / scholars for future interaction / brainstorming / collaboration?
I don't measure the conference worth based on fees because once I'd paid - it is considered sunk cost whether I attend or not.
Thanks for your answer. Networking with other researchers / scholars for future interaction / brainstorming / collaboration is indeed one of benefits of Research Conference.