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 )
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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'
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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