Use comments on your proposal to revise for your poster -- especially if you failed to include 2 closely related prior studies, failed to include a hypothesis paragraph, or were unclear in your methods section.  This need to be fixed for your final presentation of your study.

Introduction
    What is your topic/main question?

    Background
        Briefly mention prior work (cite 2 closely related studies)

    Current study
        What is your specific objective with your experiment?
        Briefly state what the task/manipulation will be
        State predicted result based on your hypothesis

Method
    Who were subjects/how many?
    What did subject do?
    What did you manipulate?
    What did you measure?

    SHOW EXAMPLES OF TASK
    SHOW FLOW CHART OF PROCEDURE (optional if simple)

Results
    (point to graph, with statistics at bottom)
    What did you find in plain English? ("women remembered more names than men")

Discussion
          Remind reader of purpose of experiment/hypothesis
          Summarize data
          State whether hypothesis supported
 
          Interpret findings: (Important -- must do all 4)
          Discuss any peculiarities, unexpected findings, weaknesses or potential reasons for failures
          Relate findings to other work
          Summarize importance
          Make suggestions for future work

The above points are EXACTLY what you will be graded on for both your poster and oral presentation.  If you turn these items into 20 sentences, you will have an excellent spoken presentation of about 3 minutes in length.