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Rud éigin a tharlaíonn sa saol a chuireann athrú ar luach nó stádas míre sonraí nó ar aonán sa chóras. Is féidir é a thaispeáint mar shreabhadh sonraí atá freagrach as stóras sonraí a nuashonrú ar DFD.
Something which happens in the world that causes a change in the value or status of a data item or entity in the system. It can be shown as a data flow responsible for updating a data store on a DFD.