>-----Original Message----- >From: thelist-admin at lists.evolt.org >[mailto:thelist-admin at lists.evolt.org]On Behalf Of Martin >>>Depends on the benefit case. If you're working on a site with a tight >>>business case, losing 10% of your users without good reason could >>>be the difference between substantial profit or loss. >>> >> >>Any project which can't take variances of 10% of potential users shouldn't >>be doing it in the first place. Particularly if losing 10% is >going to give >>you a substantial loss. > >No, that's not what I meant. Any project will already have variances >which you won't be able to control. Adding a 10% drop in the available >universe (via an explicit choice you've made) before those variances >kick in could well make the difference. > huh? by definition you must have defined the potential user population before you make assumptions. And, at the end of the day, 10% of customers is 10% of customers. It doesn't matter whether you take them out of the population or one of your other assumptions are wrong. This email may be confidential and contain commercially sensitive information. Only the intended recipient may access or use it. If you are not the intended recipient please delete this email and notify us promptly. We use virus scanning software but exclude all liability for viruses or similar in this email or any attachment.