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Chapter 3: A brief history of rules > 3.3. Recent developments - Pg. 62

3.3 Recent developments 41 4. a conditional start event which causes the following process to be initiated when a particular con- dition becomes true: for example, a particular part is reordered when the quantity on hand drops below a pre-defined threshold (the `reorder point'); 5. a timer event which causes the following process to be initiated after a particular duration of time has elapsed: for example, if a cover note for vehicle insurance is not converted to a full policy within a particular period after the issue of the cover note (e.g., 7 days), the insurer must contact the party taking out the cover note; 6. an interrupting event which causes the process to which it is attached to be aborted: for example, if a case of real property transactions which has been lodged with a Land Registry is found to contain signed documents which have been changed since signature, 8 it is immediately returned to the party that submitted the case and no further processing occurs. Note that, if a sequence is shown, one might infer that there is a true dependency, in that the second process must not start until the first process has finished. Often, however, the two pro- cesses share a resource (such as the person or role that performs those processes or the equipment required to perform those processes). Sometimes, it is not practical to perform both processes at the same time. And sometimes the sequence is merely one of convention, in that the two pro- cesses could equally correctly be performed in reverse sequence. For example, when getting ready for work