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Message: [QUOTE="Robert Klemme, post: 4634967"] Since you are using an instance variable you control how it is accessed. So, yes. If you want to know whether there is a hard way to prevent reassignment to instance variables, the only safe way I know off the top of my head is to freeze the owner: irb(main):001:0> o=Object.new => #<Object:0x10171ed8> irb(main):002:0> o.instance_variable_set "@foo", 1 => 1 irb(main):003:0> o => #<Object:0x10171ed8 @foo=1> irb(main):004:0> o.freeze => #<Object:0x10171ed8 @foo=1> irb(main):005:0> o.instance_variable_set "@foo", 2 RuntimeError: can't modify frozen object from (irb):5:in `instance_variable_set' from (irb):5 from /opt/bin/irb19:12:in `<main>' irb(main):006:0> Kind regards robert [/QUOTE]