Although it is always interesting to engage as many people in clubs, associations and groups engaged in outdoor activities, the selection of candidates is a necessity.
Never finished know ourselves, so it is impossible to predict in all cases how we will behave in the future, particularly in completely new situations, difficult, risky or extreme. In other words, how we behave in front of a survival situation? The question can not be answered in all cases and this is a problem for the leader of any group engaged in outdoor activities, it can have no certainty that the people under their responsibility will react properly in such cases . For mountain guides, tours, etc.. this is part of the job because rarely could or should select participants for their trips if they depend on such work to live. That is, rarely reject a client or restrictions will be imposed unless there are laws or regulations in this regard. But in other cases it is possible to take some action.
One extreme or superlative example is that of people who travel into space: space agencies like NASA are responsible for selecting good people suitable for the task, and try to avoid by all means available to persons who are not appropriate criteria according to their travel to outer space. In the military there is usually a similar phenomenon, although of course, the selection criteria are different.
What these two examples show is that professional organizations dedicated to exploring the outdoors or recognized and adopted as part of themselves to selectivity, not because they wish to discriminate against anyone, but because they have proven that not all people are able to accomplish certain tasks. The same must be understood at the amateur level, although the role of a club is usually spread a sport, a hobby, etc. would be a significant error to assume that any candidate who is present can be accepted. The problem is that the desire to have more partners and develop the activities that have been proposed by members of these organizations, they often overlook some precautions are necessary and reasonable.
A growing number of accidents among aviation enthusiasts in the early twentieth century led to governments and international organizations then began to impose some restrictions and exams to pilots and qualified candidates. Thus it was recognized that the flight schools and flying clubs are simply not able to take an objective to select those that can admit as stu thus arose the first psychophysiological tests that must be approved by government agencies before even taking the first flight lesson, and final tests that are administered to those already to get their licenses, commissioned by government inspectors.