The year 2014 marked a double anniversary: the 35th and 25th anniversaries of the publication of two seminal papers of Giacomo Becattini on the industrial district. The first paper (Becattini, 1979) conceptualizes the industrial district as a «unit of investigation», while the second (Becattini, 1989) conceptualizes the industrial district as a «model of production». Between the two papers there is a mutual dependence. The industrial district as a «model of production» deprived of the industrial district as a «unit of investigation» loses its originality as a way of interpreting economic change and becomes merely «one type of a cluster». This paper deals with the relationship between district and cluster, then also between the industrial district as a singular theoretical construct and the many industrial districts described by empirical investigations, and concludes with some remarks on the topicality of the industrial district.