Sequence of events diagram

Process—Method of interrelating steps, events, and mechanisms to accomplish an action or goal. Process flow diagram—Sequence of events diagram. 

When a safety significant event is identified, an attempt is made to deteimine why the event happened. Was it the result of an unsafe condition (latent failure) or an unsafe act (active failure) The active failure(s) may stem from an unsafe condition(s). The investigators drill down imtil no other items remain (the last underlying factor). An example of a sequence of events diagram is given in Figure 3.3. 

The events and causal factors chart for this incident is shown in Figure 7.9. The primary sequence of events is shown horizontally in bold boxes. Secondary events are shown in the other boxes, and conditions are in ovals. From the diagram three causal factors were identified and carried forward to the Root Cause Coding to establish the root causes of the causal factors. 

Gantt charts are limited in their ability to show the interdependencies of activities. In projects where the steps flow in a simple sequence of events, they can portray adequate information for project management. However, when several steps are under way at the same time and a high level of interdependency exists among the various steps, PERT diagrams are a better choice. 

A sequence diagram is an alternative presentation of the same information as shown in a collaboration diagram and is better at showing the sequence of events but the collaboration diagram also shows the links and objects. As an example, Figure 6.36 shows the sequence of the propagation of changes. 

A diagram depicting the sequence of events leading to an incident has a number of advantages over a simple timeline that may be summarized in three main areas investigation, identifying actions, and reporting as shown below.h)... 

Diagrams enable all involved in the investigation to visualize the sequence of events in time, and the relationships of conditions and events. 

Diagrams should help to prevent inaccurate conclusions hy revealing any gaps in the logical sequence of events. 

The next phase of investigation involves developing a preliminary chronological description of the sequence of events that led to the failure. Timelines can be developed in various formats and levels of detail, from simple lists of events to complex sequence diagrams or causal factor charts, usually dependent upon the particular circumstances of the investigation being conducted. 

There are a number of quality assurance checks that should be considered before identifying the final list of causal factors. It is important to test for sufficiency of the information when compiling a sequence diagram. This test for sufficiency may be performed by asking one or more of the following questions, when comparing two adjoining facts in the sequence of events ... 

Fig. 7. Extension of the sequence of events at a single p subunit to the ATP synthase enzyme as a whole during ATP synthesis, as proposed by the torsional mechanism. The diagram is drawn at 60° intervals of the movement of the e subunit. Binding of substrate converts the two-nucleotide state (the resting or ground state) to the three-nucleotide state. Catalysis takes place in the three-nucleotide state, which converts back to the two-nucleotide state with release of product [18]...

Fig. 16.5 (a) Schematic diagram of the experimental setup, (b) Energy diagram of the Na atom showing the levels populated by the stepwise laser excitation and the microwave transitions, (c) Sketch of the sequence of events experienced by the Na atoms (from... 

Figure 3. Diagram of the sequence of events during the preparative HPLC separation. The boxes on the sample line indicate retention times of fractions that may be collected for further analysis.

The process of data acquisition results in an FID signal residing in the computer of the NMR instrument. In order to properly set up the acquisition parameters, it is helpful to understand a little about how this is accomplished. We will follow the sequence of events involved in the acquisition of the raw data for a simple ID ll spectrum on a 200-MHz instrument through a simplified diagram of the spectrometer ... 

Plot diagrams help writers write about a personal experience or create a fictional story that is based on specific directions. With important minutes ticking away from the finite amount of time essay tests allow, a plot diagram helps you quickly map out a sequence of events that suits your essay s directive and helps maintain the focus of your story. Because stories— whether real or imaginary—include settings and characters, plot diagrams should really be one part of a story map, which includes two important word webs one for setting and one (at least) for the main character. 

A plot diagram is important to the writer asked to write a story, because it allows you to map out a sequence of events that suits the essays directive and helps maintain your story s focus. Don t forget quick word webs to establish your setting and characters. Of course, a braintalk like the one to the right will help too ... 

FIGURE 14-41 Schematic diagram illustrating the sequence of events in injection molding. 

FIGURE 14-45 Schematic diagram of the sequence of events (from top to bottom) that occurs during the filling of the cavity. 

FIGURE 14-66 Schematic diagram of die sequence of events that occurs in stretch blow molding. 

FIGURE 8.24 Schematic diagram showing sequence of events beginning with the blockade of the hERG potassium channel in the heart that causes QT-interval prolongation that eventually can lead to a potentially fatal arrhythmia called torsades de pointes. 

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