Rails - Apr 2006 - Class definition OK?

Something''s not working, and I just want to make sure that my class is 
not to blame and that I''ve got how it works straight in my head:

The attr_reader parts make those :something (hash values, i think) 
accessible as @class.something attributes outside of the class. So, once 
I find the right session in the controller, I can access those values as 
@session.something. Right?

For some reason I''m just getting zero for @question_total and errors
for
@point_total...

class Test_session

  attr_reader :point_total
  attr_reader :question_total

  def initialize
    @point_total = 0
    @question_total = 0
  end

  def keep_score(points)
    @question_total += @question_total
    @point_total = @point_total + points
  end

end

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