Then there are the 'can't do" types who want to maintain the status quo. Since they have often been in the organization for a long time, they frequently quote historical experience as a ploy to block change "It won't work, we tried that in 1984 and it was a disaster." A more subtle version of the "can't do' type, the "yes, but..", has emerged recently. They have learnt abou the need to sound positive, but they still can't bear to have things change.