Is there any difference between 制定, 制订 and 拟定?
制订 http://www.cantonese.sheik.co.uk/dictionary/words/5836/

制定 http://www.cantonese.sheik.co.uk/dictionary/words/5830/

拟定 http://www.cantonese.sheik.co.uk/dictionary/words/20601/


  制 [1] [v] establish; institute; set up
  
  订 [2] revise; edit; amend; make corrections
  
  制订 means 'to work out; to formulate' 
  
  Example: 'The law makers 制订 a bill'
  
  The bill is formulated (also edit, amend before finalize ) 


~


  制 [1] [v] establish; institute; set up
  
  定 [2] [v] decide; fix; set; settle
  
  制定 means 'to draw up; to formulate'
  
  Example: 'The law makers 制定 a bill'
  
  The bill is formulated and set'


~


  拟  [1] intend; plan; decide
  [2] draft; draw up; design 
  
  定 [2] [v] decide; fix; set; settle
  
  拟定 means 'to draft; plan'
  
  Example: 'The law makers 拟定 a bill'
  
  The bill is drafted, planed