In some cases/senses these two words are interchangeable. In others "presume" is like "assume" with an edge. It's mainly a difference in connotation. For example, to presume can mean to assume with no basis. I put links ...
http://uk.answers.yahoo.com/question/index?qid=20060711...
・ Presume has alway seemed to imply a future context, often more a question than a statement. Sort of a ... ・ Trina L. Grant | Professional Freelance Writer on April 7, 2009 5:21 pm “Assume” can also be used ... ・ Brad K. on April 8, 2009...
http://www.dailywritingtips.com/is-there-a-difference-b...
These two words are—ahem—assumed to be interchangeable in most contexts. There is, however, a subtle difference between them.
http://www.justlizzen.com/2009/07/word-faq.html
it's been asked before and answered much much better, isuggest you just look up an older version of your question than vote for any of the answers below
http://ph.answers.yahoo.com/question/index?qid=20080502...
In many contexts when the meaning is 'to suppose', the two words are interchangeable: e.g. I assume/presume you are coming to the party. But, as the Pocket Fowler's Modern English Usage (Ed. Robert Allen. Oxford University Press, 1999) poin...
http://www.funtrivia.com/askft/Question110183.html
presume to believe something to be true because it is very likely, although you are not certain: ex I presume (that) they're not coming, since they haven't replied to the invitation assume to accept something to be true without question or ...
http://uk.answers.yahoo.com/question/index?qid=20081107...
Both ASSUME and PRESUME have more than one usages. Hence, I prefer to confine my answer strictly to the area of your confusion. If you ASSUME that somethng is true, you accept that it is true, although you have had no real proof of it. If y...
http://answers.yahoo.com/question/index?qid=20060930164...