[R] randomized block design and two-way factorial design

[Michael Wang]

I am still a little unclear in the difference between
randomized block design and two-way factorial design
after consulting a few books, including John Rice 
Mathematical Statistics and Data Analysis.

Both put observations in cells corresponding to two factors
of many levels. Both use the same computer program to analyze
data. 

It seems that randomized block design can have only one observation
per cell, is this true? And Friedman's can be used for
randomized block design but not two-way factorial design?

If this is not a good place to ask generic statistical questions,
I will not do so in the future. If you know a good place to do this,
please recommend. Thanks. 
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