Easier to Say is Easier to Remember

I'd like to help you step away from a tendency that is common among beginning speakers.  This is the tendency to go too far.  When you say too much you make it hard for listeners to rememmber.

I have a lot of chances to visit the classrooms of new college instructors.  They've got large textbooks and short quarters.  They often feel pressured to talk about everything in the textbook during a lecture to make sure they've "covered" everything.  This would be an admirable goal if it weren't based on a fallacy.
  

The underlying assumption of a long lecture is that if the teacher has said a thing the students know it.  I doubt that more than one percent of us could repeat a 20-minute lecture word-for-word 10 minutes after we have heard it.  So we clearly don't fully know what was said, let alone how to understand or apply it.

The solution makes life easier for you as the presenter and for the listener.  You take big ideas you want to communicate and explore them, leaving out some details or related ideas that are lower priority.  Spend more of your presentation time building meaning for your listeners.  You do this by helping them to apply the concept they have just learned through questions and examples.

Let's use Maslow's hierarchy as an example.  You could show a Powerpoint slide with all the levels of Maslow's hierarchy and their definitions, reading each to your listeners, then explaining further, helping them catch up on some much-needed sleep.  Or, you could ask, "How many of you ever gave up trying to make dinner because you were so tired, and didn't eat anything until breakfast the next day?  Some needs outweigh others and must be satisfied first.  Abraham Maslow described types of needs and which order they must be satisfied in."   You could then ask them to contribute to a list of needs and rank them.  Once they've got the general idea they will easily understand Maslow's work and can assimilate the details.

To apply my own principle here:  Just remember to give the big ideas in a simple way.  This makes them easy to remember.  Details come in time.