BEKHUIS J (1982) Cooperating Organizations Bird Research Netherlands. Atlas Project for Winter and migratory birds. Fieldwork progress, preliminary distribution maps. LIMOSA 55 (4): 142-142.

Following the overview of the progress of the fieldwork in the months of October through January (Limosa 55 (3): 93-98) voigt now the list for February through May (Figure I), Reactions to the October to January inventories reveal the need some misunderstanding about the research assessment. Therefore it can not hurt the followed another way to state. Provided that should be the monthly statements not involve assessment of the ornithological qualities of the staff. Alleriei aspects such as the deployment of the observer or the number observers per block are ignored. Our assessment is based purely on a comparison in the number of species as in the computer printout for the study period to May 1982 is indicated by the number of species we expect in the month in block occurs. Irrespective of whether a block by ten Observers regularly scoured or the concerns that a block along with nine other blocks by one observer only occasionally superficial can be inventoried. They are aile the same criteria assessed. According to some comments, people sometimes do not agree with our expectations. These were here and there are set too high. Discuss this in more detail before will be, it is useful to recall how we determine what we expect in a given block in a given month of species is possible. First, each district several blocks selected which are known to be closely ge'inventariseerd by good birders. These blocks we use as a reference atlas for the surrounding blocks. They give us a good impression of what a particular month in that region is possible. Then are using a card to be assessed blocks compared to adjacent reference blocks in the degree of similarity in habitat types. On this basis, a rough estimate made of the number of species in the blocks can be expected. Then looks at how determined number of species in these blocks corresponds to the expected number of species. On Based on this comparison we review whether the block adequately inventoried, or that additional fieldwork necessary or desirable. When less than 75% of our expected number of species determined, we need additional testing; at 75-90% extra inventory we find desirable. We do not claim that our assessment are is correct. Because many details are not yet in the computer, the current situation generally brighter than the monthly statements show, The Observer itself has more recent information, while we dependent on the computer printout increasingly Lagging behind. This explains some of the cases which employees do not agree with our assessment. Another cause for a difference of opinion the completeness of the fieldwork is based on a disagreement on the number of species to expected to occur in a block. Here too, will sometimes mistakes are made. For example, the quality of a forest or wetland is not the card to read, it is therefore best to avoid our expectations too high here and there. It should be emphasized that the monthly statements not intended to looking back on the past four years of research an assessment of the inventory work done. The reports are In contrast, the newsletter posted to indicate which blocks the additional inventory most desired in the final year of study. Bye the observers is to assist in selecting blocks where their efforts are most needed

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