Check the questions a listener should ask himself to judge a speaker's speech (mark all that

is support based on fact or opinion?
is the speaker an authority on the subject?
are the speaker's arguments logical?
is enough evidence given?
is the speaker dressed appropriately?

I would say that all these questions are valid and to the point though perhaps a little less so re the dress. If the speaker is logical, gives sufficient evidence based on solid facts and obviously knows his subject either being an authority on the subject or showing that he/she has closely consulted with those who are, then the speech should be well received.