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[answered] Buildit is a construction company specialized in public wor


Buildit is a construction company specialized in public works (roads, bridges, pipelines, tunnels, railroads, etc.). Within Buildit, it often occurs that engineers working at a construction site (called ?site engineers?) need a special type of equipment, such as a truck, an excavator, a bulldozer, a water pump, etc. Buildit has some heavy equipment available in its depot, but very often, it hires equipment when needed from specialized heavy equipment suppliers.

Figure 1. Plant for hire (image taken from Holden Plant Hire Ltd., UK)

A piece of heavy equipment is called a ?plant? in the construction jargon. When a site engineer needs to hire a plant, he/she sends a Plant Hire Request to one of the clerks at the depot. This request takes the form of a PDF document that the site engineer has to fill in. It takes on average 15 minutes for the site engineer to fill in and send the PDF file. Incoming plant hire requests usually stay about 15 minutes in the clerk?s mailbox before being processed.

The clerk at the depot first checks if an appropriate plant (owned by BuildIt) is available at the depot for the required period of time. If it is, the request is filled within one hour and the plant is delivered to the construction site usually in 4 hours. This happens in 10% of the cases. Otherwise, the clerk checks an information system that lists all equipment offered by the suppliers and selects the most cost-effective plant that complies with the request. She then checks the availability of the selected plant with the plant?s supplier via phone or e-mail. This availability enquiry takes on average one hour. Sometimes (about 20% of the times), the selected plant is not available and the clerk has to select another plant and check its availability with its supplier, and so on.

Once the clerk has found a suitable plant available for hire, she recommends that it be engaged (to ?engage a plant? is the term used to say that the plant will be hired). The engagement of every plant has to be approved by a ?works engineer? who also works at the depot. The works engineer usually approves plant engagement requests twice per day. Because of that, a plant engagement approval takes on average 3 hours. In 10% of the cases, the works engineer rejects the plant engagement request. Half of the rejections lead to the cancellation of the Plant Hire Request (no plant is hired at all). The other 50% of rejections are resolved by replacing the selected plant with another plant (a cheaper plant or a more appropriate for the job). In this latter case, the clerk needs to perform another availability enquiry (or several enquiries). Once the works engineer has approved the engagement, the clerk sends a confirmation to the supplier (including a Purchase Order for hiring the plant) and she records the engagement in an Excel spreadsheet that she maintains in order to keep track of all the approved plant engagements. The clerk generates the Purchase Order using the company?s financial information system (the ?Finance Module? of an ERP system). It takes about 1 hour for the clerk to prepare and send the confirmation and purchase order. Most of this one hour is ?waiting time?.

During the process, it may happen (about 10% of the times) that the site engineer decides that the plant is no longer needed. In this case, he/she asks the clerk to cancel the request for hiring the plant.

When the plant is hired, the supplier delivers it to the construction site at the required date (or in about 6 working hours if the request is urgent). The site engineer inspects the plant and if everything is in order, he/she accepts the engagement and the plant is put into use.

Tasks

[35 points]. Model the above "as is" process fragment in BPMN 2.0. ?Keep in mind that the purpose of this BPMN diagram is to serve as a means of communication between the company?s managers and employees, and the business and IT analysts who have to re-design and automate this process.? Thus, please create the necessary collaboration (20 points) and choreography diagrams (15 points).? You may wish to do the choreography diagram first.? You will need access to Signavio to do the choreography diagram.? See academic.signavio.com to register if you have not already done so.

Please ignore specifics about activity durations, unless they specifically impact a choice of BPMN diagramming component.? Diagrams must be complete, showing resources, data and information artefacts used, and proper labelling of all diagram components.

 


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