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Answered: - Domain class diagram. Produce an analysis class diagram fo

Domain class diagram.

Produce an analysis class diagram focusing on the problem domain. At this point it is not required to be fully attributed. However it is important that you attempt to model as many of the entities as possible, and to ensure the correct multiplicity. A large amount of the required information is present in the OVERVIEW section of the case. However it is important to study the whole case as there may be other details or important context that is situated in other sections. (35)




Activity Diagram.

Draw an activity diagram to show the flow of activity for the process of supervisor actions on waiting emergencies. This describes the situation when an operator is attempting to dispatch a response team but no teams are available. As with previous questions, the most relevant section of the case has been highlighted as a hint. (20)









Date Due: Monday 4 April 2016



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To submit:


1. Domain class diagram.


Produce an analysis class diagram focusing on the problem domain. At this point it is not


required to be fully attributed. However it is important that you attempt to model as many of


the entities as possible, and to ensure the correct multiplicity. A large amount of the required


information is present in the OVERVIEW section of the case. However it is important to study the


whole case as there may be other details or important context that is situated in other sections.




2. Decision Table.


Draw a decision table to capture the logic of determining the priority category for a call. This is


explained in the interview section on page 6.


You may wish to follow the decision table examples/exercises used in the tutorials as a template


and starting point for this exercise. (25)


3. Activity Diagram.


Draw an activity diagram to show the flow of activity for the process of logging an emergency


call and dispatching a response team. Most of this activity flow is explained in the interview


section of the case on page 8. Two of the most relevant items have been highlighted in the case


as a hint but other useful information may be present elsewhere. End the activity diagram with


?Close Emergency Call? even though this may not explicitly be stated in the interview section


highlighted. (20)


4. Activity Diagram.


Draw an activity diagram to show the flow of activity for the process of supervisor actions on


waiting emergencies. This describes the situation when an operator is attempting to dispatch a


response team but no teams are available. As with previous questions, the most relevant section


of the case has been highlighted as a hint. (20)






Rescue911 Case


The following sections provide an overview of Rescue911, providing background to the business,


problems experienced, and requirements for the new system. Additional detailed information is


presented in the form of data gathered from interviews with key stakeholders.





(Question 1)


Rescue911 is an ambulance and emergency services company. The company operates a single 24houremergency operations call center in which all calls to Rescue911 are received and processed.


Response teams are dispatched by call center operators. They are all trained emergency medical


dispatchers. Rescue911 has approximately 2000 EMTs (emergency medical technicians) working in these


response teams. Response teams are located at 25 base stations that are distributed across the


geographic region serviced by Rescue911. As a private ambulance and emergency services company, the


assignment of response priorities and the coordination of the dispatch process are core to Rescue911?s


value offering. The dispatcher plays a key role in matching Rescue911?s response capability to emergency


situations.Rescue911 knows that the overall effectiveness of the EMS system begins with the logging of


emergency calls and the dispatch of response teams.


People that make use of Rescue911?s services include subscribers and non-subscribers. Direct


subscribers are individuals or families that subscribe directly to Rescue911and pay a monthly fee.


Indirect subscribers are automatically subscribed to the services of Rescue911 as a result of their medical


aid scheme, home insurance or life assurance policies. These medical aid and insurance companies are


called providers. The indirect subscribers do not pay the monthly fees; instead Rescue911 recovers


monies from their providers by billing the providers directly for the services rendered. Non-subscribers


can also make use of Rescue911?s services i.e. Rescue911 will respond to all emergency calls received.


However, non-subscribers will be billed for any emergency care provided to them.Rescue911 has seen


significant growth in operations in recent years. They currently have 2 million subscribed members


(direct and indirect), 2008 revenue was $500million, and in the first 6 months of 2009 they have


responded to 125 000 emergency incidents, an average of 25 emergencies per base station per day.



Organization Structure


Rescue911 has a flat organizational structure. Beyond the Chief Executive Officer (CEO) there are only


three senior managers, the Chief Medical Officer, Chief Operating Officer and the Chief Financial Officer.


The responsibility of the Chief Medical Officer is to make sure that Rescue911?s dispatching and medical


procedures adhere to the expectations of the National Association of EMS Physicians. The Chief


Operating Officer is responsible for the day to day business. He is in charge of the call center and all base


stations. The call centers operators are emergency medical dispatchers certified by both national and





international academies of emergency dispatching and have been trained in emergency


telecommunications. Rescue911?s organizational structure is depicted in Figure 1.



Figure 1 Organizational Structure



Problem Statement


The recent growth of Rescue911 has not come without its problems. Rescue911 has begun to receive


numerous complaints about their services from subscribers and providers. They are also under


increasing pressure from the government, hospitals, doctors, medical aids and insurance companies to


properly account for their services. Typical problems include: spending too much time monitoring and


coordinating response teams instead of focusing on the medical aspects of dispatching, lack of real-time


information on EMT and response team availability, inability to confirm for callers whether a response to


an emergency has been dispatched or to provide details on the response configuration, inability to


determine which emergency calls have been closed / concluded and which are still in progress, under


qualified teams are often dispatched and themes arriving at a scene are not adequately skilled to deal


with the emergency situation, over qualified teams are being dispatched to noncritical incidents leading


to poor utilization of skilled resources, lack of proper documentation of services provided at a scene to


both subscribers and non-subscribers, inaccurate records of shifts worked by EMTs at the various base


stations, incomplete records of EMTs and their qualifications, and lack of metrics for performance


management especially in relation to response turnaround times.


Rescue911 management has determined that many of the problems result from inadequate systems that


have not kept pace with their growth rate. They aim to solve these problems through the introduction of


a new information system. The system is to be called ERIS (emergency response information system).


The new ERIS system is aligned to Rescue911?s objective to maintain the infrastructural capacity needed


to deliver comprehensive emergency service solutions. Through the implementation of ERIS,





Rescue911management aim to ensure the company can realize its key performance objective to


standardize the process of call logging, ensure accuracy of response team dispatching, and improve prehospital treatment and customer satisfaction with response performance. The system will also provide


for improved internal operational effectiveness, more efficient utilization of response teams, and better


management control over base stations.


There will be three groups of users of ERIS:


1. Call Center Operators, the emergency medical dispatchers, who will use ERIS to log emergency call


details, dispatch one or more response teams, and follow up on calls dispatched. Supervisors are a type


of operator who are also able to deal with those emergency calls to which operators are unable to


dispatch a response due to response team unavailability, and to authorize the cancellation of an


emergency response


2. EMTs that will report for duty (clock-in) at the beginning of their shift by logging into ERIS and will also


use ERIS to input details about patient care provided at emergency scenes


3. Rescue911 managers who will use ERIS to produce certain reports. These reports included demand


reports, schedule reports as well as exception reports. Managers are also responsible for maintenance of


master file data.



Functional Requirements


ERIS will be implemented using a phased approach. Based on the needs identified, the following


requirements have been defined for inclusion in the first-phase of the ERIS project (see Table 1), while


later phases will incorporate billing, accounting and finance, vehicle and asset management, and a


mobile, PDA based, EMT-patient caresub-system.The above requirements will be met through the


following four sub-systems:


1. Computer aided dispatch sub-system (CAD) ?Primary users: Operators and Supervisors.


a. Log emergency calls received.


b. Dispatch, track and manage emergency responses.


c. Reporting and online querying.


2. Base Station management sub-system (BSMS) ?Primary users: EMTs and Managers.


a. Base station records management.


b. EMT records management


c. Response team records management


d. EMT shift logging (clocking in and out)


e. Reporting


3. Subscriber management sub-system (SMS) ?Primary users: Managers


a. Direct and indirect subscriber recordsmanagement


b. Reporting


4. Electronic patient care reporting sub-system(EPCR) ? Primary users: EMTs


a. Capture patient care data


b. Reporting






Table 1 Selected user requirements



Interviews with Stakeholders


Interview with Mr. Tye Red, Chief Operating Officer, to understand details related to handling of


emergency calls and dispatching of response teams


Q. Please explain the concept of an emergency


A. There are many types of emergencies to which Rescue911responds. Typical emergencies include:


vehicle collisions, heart attacks, strokes, shootings, stabbings, child birth,drownings, allergic


reactions, choking, broken bones, and numerous other household accidents and incidents.


Q. What are the responsibilities of operators when answering an emergency call?


A. Rescue911?s call center operators are Emergency Medical Dispatchers that possess special


knowledge and skills. Dispatchers not only log calls and dispatch response teams, they are also


responsible for the medical aspects of dispatching, providing direction and pre-arrival instructions to


callers. Through caller interrogation, dispatchers are able to evaluate the severity of the injury or


illness, allocate the call to a priority category, and ensure that they dispatch an appropriate response




Q. How exactly is the priority category determined? And what role would you like the system to




(Question 2)


A. Operators are highly trained to determine the severity of an emergency and assign the call to a


priority category. This function is not required to be automated by the system. The priority category


of an emergency is determined by the dispatcher at the time of the call based on information


provided by the caller. Criteria based dispatch guidelines provide a series of well-structured


questions that operators have been trained to ask of callers. The priority category, and the estimated


number of patients involved, determines the response configuration i.e. the number and skills levels


of response teams that need to be dispatched. The priority categories are:





1. Minor incident cases where treatment can be delayed. These are mostly minor single victim


/patient accidents requiring basic care levels.


2. Stable cases where single or multiple victims /patients are reported but all are conscious and


considered stable. Prompt but basic treatment levels are required.


3. Serious cases when a single or multiple victims /patients are reported and one or more are


unconscious or considered unstable due to possible injury to vital points. Prompt and advanced


treatment is desirable.


4. Critical trauma cases when a single or multiple victims / patients are reported and one or more are


unconscious, not breathing, or have lost a great deal of blood. Prompt and advanced treatment is


necessary for patient survival.


Prioritization is core to the effectiveness of the dispatch process to ensure that appropriately


qualified teams are dispatched to provide the appropriate level of care. The dispatching operator


needs to input the priority category of an emergency as well as the number of response teams that


are required. Operators also need to capture the address, nearest landmark to the emergency, the


phone number and name of the caller, and a brief description of the emergency. Once these details


of an emergency are captured, we consider the emergency call as being in a ?logged? state. The


operator should then proceed to dispatch a new response, or link the call to an existing emergency




Q. What do you mean by dispatching a response and linking the call?


A. An emergency call should result in what we term an emergency response. This is the actual


dispatching of one or more teams of particular skill that proceed to the emergency location in a


certain response mode (e.g. red lights and sirens versus routine driving).Sometimes Rescue911 will


receive more than one call for the same emergency situation. Operators will determine if any new


calls received are related to existing calls and can then link the call to an existing emergency


response. This will ensure that the operator does not dispatch a response to an emergency which is


already being dealt with. The operator will inform the caller that Rescue911 is already aware of that


emergency situation and that a response team has already been dispatched to that scene. Obviously


this is not a faultless process and we have had situations before where two different emergencies


have occurred in close proximity. Operators have incorrectly assumed that callers have been


referring to the same emergency situation. Therefore, we would like an operator tube able to refer


the details of any emergency situation already recorded so that they can clearly determine from the


caller whether the emergency being reported is indeed a new one.


Q. Can you please explain more about the process of dispatching a response team?


(Question 3)


A. Response teams are dispatched from one of 25 base stations. Response teams are dispatched


based on availability, proximity to the emergency location, and the response team?s grade. The new





ERIS system does not need to determine which base station is closest to the emergency. Instead,


operators already have access to a sophisticated GIS/ GPS (geographic information system and global


positioning system) that is used to map emergency locations to base stations. When initiating a


dispatch for a new emergency response, we?d like for the operator to simply be required to input


into ERIS the base station ID of the nearest base stations determined from the GIS / GPS system. Our


GIS/GPS system shows our base station locations, and emergency response flags. Operators use this


system to find base stations closest to reported emergency locations. Some of our very experienced


operators often know the different areas so well that they can recall by heart the closest base


station. We?d like for the new ERIS system tallow operators to use the base station ID in order to


begin the process of searching for an available response team. The operator dispatches a response


team by radioing the relevant base station ?Control to Base Station AA.Response Team XXX Proceed


to Location XXXXXX. Over?.


Once a response team is dispatched, the operator waits for the response team to respond over the


radio system with ?Roger Control. Response Team XXX Proceeding to Location. Over?.


If no response is received within 15 seconds, the operator radios the team again. If no response is


received within further 10 seconds, the operator is required to dispatch another team. The system


should enforce this confirmation process i.e. the operator must confirm that a response team has


acknowledged the call and that they are preceding tithe scene. Once confirmed, we consider the


Emergency Call as having changed from a ?logged? to ?actioned? state, and the system should record


that a responding team has been dispatched.


Q. What happens next?


(Question 3)


A. The operator will radio a description of the emergency tithe responding team. The operator will


also request that responding team radio in to the control center upon arrival at the scene. The


response team will typically call in upon arrival with ?Response Team XXX to Operator. Response


Team XXX on Location. Respond. Over? Any operator at the control room can then respond ?Roger


Response TeamXXX?. This is important step in the process as it allows us to know that a responding


team is actually ?on-scene? and the time of team?s arrival.


Q. Does the process always run as smoothly as you?ve described it? Are there any exceptions?


(Question 4)


A. Yes, of course there will always be some exceptions. For example, if an operator is attempting to


dispatch a response team to an emergency but no teams are available from an appropriate base


station, the Emergency Call is flagged as ?waiting?. Dispatch supervisors are responsible for dealing


with all calls that are ?waiting?. Usually, the supervisor will attempt to dispatch a team currently in


the field by radioing teams close to the scene and determining their availability. Supervisors are able


to do this by checking their AVL(automatic vehicle location) and GIS/GPS systems to find teams in the


field close to another emergency scene. Oral system, lets us know where each responding team is at


any point in time. If a supervisor is able to dispatch a team in the field, then they should do that. If





they can?t, the supervisor contacts another emergency services company e.g. County EMS.Once the


other service provider confirms they are attending to the call, the supervisor closes the call on our




Q. What is your expectation with regards to the integration of ERIS with the existing GIS/GPS and the


existing AVL system?


A. We don?t want you to make any changes to the existing AVL or GIS / GPS system. Their developers


(Live TrackInc) will be responsible for integrating them with our new ERIS once it is completed. They


will ensure that the AVL system and the GIS/GPS system read data from ERIS in order to update the


maps. It is not within your brief to worry about those systems. I only mentioned them so you could


understand that those systems also play a role in the overall process.


Interview with Ms Sue P. Phizer, Base Station Supervisor, to understand and clarify the roles of EMTs


and response teams


Q. Can you explain to us what an EMT does, and what is response team?


A. An EMT is a trained emergency medical professional. Within our company, EMTs can be one of


three EMT Grades. These are: basic EMT, paramedic, and critical care paramedic. EMTs never work


alone. They each belong to what we call a ?response team?. Each response team will have 3 to 4


EMTs. Each response team is assigned a team grade. The team?s grade is determined by the grades of


themes that make up the team. The team will be categorized as grade 1 (basic life support team), 2


(advanced life support team) or 3 (critical care team).


Q. Of what importance are these grades?


A. Grades come into play during the dispatch process. I?m sure our COO explained that process to


you. I used to working the control room as a dispatch supervisor before I was promoted to the base


station supervisor, so I have a very good idea about how all the pieces fit together. Let me explain:


Grade 1, basic life support teams, can respond to emergency priority categories 1 and 2. Grade 2,


advanced life support teams, can respond to categories 1, 2 and 3.Grade 3, critical care teams, can


respond to categories 1, 2, 3and 4. Grade 1 teams ride in basic life support ambulances, while grade


2 and 3 teams ride in advanced life support ambulances.Rescue911?s priority dispatch rule is always


to configure response with a team whose grade meets the emergency?s priority category rather than


exceeds it e.g. for a category 2 emergency, dispatch operators should first try dispatch team with


grade 1, if none are available then try a grade 2 team, if none available then only try a grade 3 team.


This is done to ensure that advanced and critical care response teams are reserved for the most


serious of emergency priorities.


Q. Can you please explain more about how the shifts work?


A. Response teams work on 1 of 3 shifts. There is a 12am to 8am shift, and 8am to 4pm shift and a


4pm to 12am shift. When EMTs arrive for work, at their shift time, they need to ?clock in?. Response


teams usually have three to four EMTs assigned. If a response team has only 1 team member that





has reported for duty on their allocated shift, then that response team cannot be dispatched to any


emergency scenes.


Q. It seems that some checks need to be performed when dispatching a team from a base station


such as yours to an emergency. Can you clarify?


A. Yes, the procedure from the control room?s point of view is to find from the nearest base station,


those response teams that are 1) on shift, 2) available for dispatch and 3) are qualified to handle an


emergency of the specified priority. But remember what I said earlier, our business rule is to dispatch


teams with just the right qualifications, so the operator must dispatch a team with the lowest


acceptable grade.


Q. Can you please go back to the concept of a shift so that I understand its implications for team




A. A response team begins and ends a shift in what we call an ?invalid? state. Once two or more


members of a response team have checked-in and reported for duty, the team then becomes


?available?. These on-shift teams will change state from ?available? to ?away? multiple times in a single


shift. When a response team gets dispatched to a scene and acknowledges their acceptance of the


dispatch to the operator, their state changes to ?away?. When the response team leaves a scene, the


state changes back to ?available?. There is a further state called ?double-dispatch?. If a team is in the


away state and asked to respond to an emergency by supervisor, their state will change from ?away?


to ?double dispatch? upon their acceptance of the supervisor?s order. Only control room supervisors


are able to double-dispatch teams in the away state. When an on-shift response team becomes


?available?, at the beginning of a shift, they are assigned a shift grade equal to the value of their team


grade. However, in the case of team whose default is critical care (grade 3), that grade will only be


assigned when at least one critical care paramedic has reported for duty. If no members on duty are


critical care paramedics then the team will be assigned a shift grade of 2(advanced life support). Oh,


I must clarify! It is the shift grade rather than default team grade that should be used when


determining a team?s eligibility to respond to an emergency. Please remember that.


Q. OK, so when deciding on which teams to dispatch, the operator should decide based on the grade


assigned to an on shift team, which might be different to their default team grade.


A. Yes. You?ve got it.


Interview with Dr Warren Piece, Chief Medical Officer, to better understand emergency response




Q. Can you please explain what happens at an emergency scene?


A. With pleasure. Insurance companies and doctors treating patients often require Rescue911 to


provide a report on the qualifications of EMTs responding to an emergency call as well as the specific


details of emergency care provided to patients at the scene. This information together with


information on their average response times may also be requested by various national accreditation





bodies when reviewing Rescue911?s license to operate as an emergency services provider. Therefore,


at the scene of an emergency, responding EMTs need to record information on emerg...


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