English economist William Stanley Jevons (1835-82) has gone down in history with a research that helped discover a human being´s ability to remember up to seven objects of the same kind at once with the variation of plus-minus two units.

English economist William Stanley Jevons (1835-82) has gone down in history with a research that helped discover a human being´s ability to remember up to seven objects of the same kind at once with the variation of plus-minus two units.

How he got to discover this knowledge is even more interesting. Namely, Mr. Jevons picked a random number of beans, threw them in a box and showed them to the subjects for only a moment (not long enough to count). After that the subjects had to guess how many beans were in the box.. The results showed that with 3-4 beans there were no mistakes and there were only sometimes mistakes when the box had five beans in it. When there were ten beans in the box then the subjects were mistaken in half of the cases and mostly, the results were wrong when the subjects needed to guess the number of 15 beans. From 1027 tests it was concluded that "7 plus – minus 2 units" is how many objects of the same kind is a human being able to remember at the same time. The results of the research were published in Nature magazine on the 9th of February in 1871.

This research, which was conducted 130 years ago, is one of the best conducted researches in the history of science. Why bring it up? Each time a barn door is opened and a 60- or 380- or 840-headed cattle heaves in sight, to the consultant they appear as the random amount of beans in Mr. Jevons´ test. In order to come to conclusions and figure out recommendations through the analysis of production factors, there must be the following chain of questions and answers: What is the relative status of milk production? Was the quantity of milk bigger or smaller last year and the year before that? How different or similar are the results of test milking and milk tank test? When are the samples taken? Which animals have too low production? What kind of production results did the beginning of serviceperiod show? How long has a cow been milked? What kind of effects do diseases or deviations have? What kind of effects do mastitis (clinical, sub-clinical), lameness and metabolic disorders have? What is the impact of prolonged calving interval?

As you see, even before feed and feeding is included, there are about ten factors that "raise the number of beans in the box " to the level of 60X10 or 380X10 or 840X10 according to which barn door is opened.

The example above describes how fast the plurality of causes and complexity of analysis is growing. It also characterizes how quickly a person´s ability to analyze the situation runs out. It is true though that there is a parameter which is difficult to define – intuition. It is a cognitive skill to sense what is going on in the barn. Unfortunately, sometimes there is not enough of it.

The more we want to know, the more data there is. The more data there is, the more difficult it is to navigate in it. To overcome to problem, there is only one solution – proper data collection and management. There is no need to pay for IT solutions until you drop – it is enough to conduct an analysis with the consultant about the need for information at beginning of the cooperation. The consultant will then collect the data necessary and analyze it.