As I said in the former note,there is no 'definition'in Cert' of slippery.It's a common sense saying there is 'verybad-no' braking action.As John says you can take your chances!!!If you slide off,after you received a 'poor' braking report-your on your own(inevery sense of the word).Should you receive a 'slippery'report,query the tower as to the last arrivals braking report,after all if he didnt slide off the end-he must have had some braking.In canada the tower will stipulate the Type giving the report,which is something to go on???Remember the crosswind limit is reduced drastically(preferably nil) with a slippery report......