A second conference looks like a good audience for your study. You presented the work earlier, but the people, questions, and setting would be different. Can you submit it again?
The handbook raises the right issue: broader discussion can be useful, but prior presentation and publication conditions need attention. The answer depends on the specific events, publications, and materials involved.
Separate the forms of earlier dissemination
Write down what was shared: a talk, poster, abstract, full proceedings paper, recording, preprint, or another public version. Keep the relevant dates and terms. 'Presented before' can describe several different circumstances.
You need that record to ask the next question accurately.
Read the new event's requirements
Look for rules about originality, earlier presentation, overlapping submissions, and required disclosure. Ask the organizers when the wording doesn't resolve your situation. Describe the earlier dissemination clearly instead of asking a vague hypothetical.
Don't assume that changing the title or audience makes the same work eligible.
Check the earlier event's and publication's terms
Consider any relevant agreements, permissions, and conditions attached to the materials. If you plan a later journal submission, examine that outlet's rules about prior dissemination too.
An abstract-only proceeding doesn't by itself establish that reuse is acceptable everywhere. A full proceedings paper also needs an assessment based on the actual terms, rather than a universal assumption.
Agree with coauthors on the next step
Discuss the proposed submission, presenter, author list, version, and required disclosures. Keep an accurate account of what is new if the work has developed. A revised project should explain its real changes rather than imply that all the evidence is being reported for the first time.
Report the professional record clearly
List presentations in the appropriate format and keep the relationship among versions understandable. Don't imply that presenting one study at two permitted events produced two independent studies.
Transparent reporting helps someone interpret the record without reconstructing it from similar titles.
Before reusing a submission, make a one-page dissemination history and compare it with the new event's rules. Save any clarification from the organizers. That gives you a defensible basis for a decision instead of relying on what someone else once did.
Adapted from The New Faculty Handbook by Zafer Unal, pp. 108-109.
