Remember that a poster is not a research article. It doesn't need to explain everything because you'll be there to do it.
Typeface & Font size:
Use the font size which can be read from several feet away. It helps when you're not trying to explain everything. Avoid using 3D texts or text with shadows, typefaces which are difficult to read or more than two typefaces in a single poster and too many text boxes in your poster.
Don’t convert your poster in to a rainbow and don’t make it dull either. Use three to four colors for your poster.
Use white or other light background. It's much easier to read a poster when it's not cluttered. You should avoid using pictures as background.
Use of Graphs, Tables & Images:
Use the poster to display key information through images, graphs and tables rather than words wherever possible. Select only a few images, graphs or tables that are easily understandable.
Use graph over tables and present your graphs & tables in an order that makes a complete sense.
3D graphs are a big NO.
If your poster is cluttered and hard to read, a lot of people will just walk by your poster. Know everything about your poster. This is especially important if you're presenting work done by a team, because presentation of a poster is more like a conversation rather than a lecture, so you need to be prepared to talk about all the dimensions of your work in the poster.
Print copies of your poster in A4 format, that way the audience can get a chance to study your poster more closely.
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