...physics 一书中，Fechner 提出三种方法來测量心理量和物理量之间的对应关系： 这三种方法分别是极限法（ the method of limits） 、 恒定法（或定值刺激法; the method of constant stimuli） 与调整法（ the method of adjustment） 。
Now,more cases will be needed to define the legal limits of business method patents.
VOA: special.2010.07.16
In the couple of decades which have passed, courts have put some limits on business method patents but have allowed a lot of them to remain powerful weapons which motivate companies like AOL and Microsoft to buy and sell.