How do you determine if a particular speech is effective?

There are several ways you can determine if a particular speech is a effective. First, you have to know what message the speaker is trying to get across. Once you know, then you can determine how well that message is displayed by use of the speakers tone, vocabulary, and length of the speech. If the speech is suppose to be serious and the speaker is speaking in a joking matter, than you know he isn't doing a good job.