Note on the Fragmentation of Disciplines It has been observed by many that the social sciences are handicapped by, amongst other things, a reluctance to co-operate with each other: The disciplines are watertight compartments. This involves a comparative sterility, especially in view of the demands of society for the treatment and solution of certain pro blems which require interdisciplinary co-operation. It seems to me that the situation is not getting better, in fact, worse, since there is a tendency to split the traditional disciplines, like sociology and economics, further into equally watertight com partments . An example of this is the development of econometrics into a subject of its own. The need for specialisation can not be questioned, but the split which occured here is far greater than can be justified by functional considerations. The fact is that these two groups, economists and econometricians, have developped into closed sets which communicate very little (the jour nals reflect this division) and which share few interests. The econometricians care little for eco nomic policy or for the collection and careful inter