Info Request Tangent Plus 1 & 2

I am looking for info on PID controller tuning methods: The tangent plus one point method and the two point method. Tried a google but can't find anything relating to these methods.
Can anyone help? TIA
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BIGEYE wrote:

Hi, Take a look at my program for controller tuning http://hem.fyristorg.com/PI_Tune/index.htm
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