One Out – All Out Gitte Larsen Forest and Nature Protection Agency Jens Broegger Jensen Environmental Protection Agency Denmark

One out – all out ideally different quality elements should give the same classification of the environmental status under stady state conditions in the same type of water bodies when there is only one type of pressure. In these cases there should be no scope for application of the "one out all out" principle.

One out – all out Different kind of pressures or a water body not in a steady state condition may cause different responses in the various quality elements and consequently the classification may not be the same for all the quality element if more types of pressures are present. In such cases the "one out all out" principle applies.