Human error is found in every task, whether it be at home or on the job. In this lab, you will

estimate and evaluate the probability of error for a given scenario. The deliverable for this

assignment is a written report. The maximum length for the report is three pages. The following

steps will lead you through the assignment. Be sure to address each step/$/$question in your report.

1.$1.$ Choose one of the following scenarios:

a.$.$ Janet is a nurse at County Hospital. Her husband was recently laid off so she has

been working 60$60$ hour weeks to earn some extra income. On a recent night shift,

Janet delivered the typical medications to her patients$$ rooms. The medications

are prefilled, labeled, and sorted by the hospital pharmacy. Patient Room 2112$2112$

contained two patients, Mr.$.$ Brown and Mr.$.$ Smith. Janet inadvertently dispensed

the wrong medication to each patient, giving Mr.$.$ Brown Mr.$.$ Smith$$s medication,

and vice versa.

b.$.$ Mike is a delivery driver for FedEx. He drives around town, delivering packages

to local business and homes. The current package Mike is delivering is supposed

to go to Ms.$.$ M.$.$ Mouse at 114$114$ Daisy Drive. However, Mike delivered the

package to 112$112$ Daisy Drive. The package did not require signature confirmation,

so Mike simply left the package on the front porch.

c.$.$ Mary works in a manufacturing plant in Smallville. Her job entails the assembly

of 3$3$ small pieces to create a widget, which is then sent further down the assembly

line. Mary sometimes forgets to include the 2$2$nd piece of the widget. There is

currently no specific order in which it must be assembled, and it is not visibly

noticeable when the 2$2$nd piece is missing.

2.$2.$ Formulate this scenario as a THERP model. At each branch in the model, estimate the

probabilities of occurrence.

3.$3.$ Based on your model in part 1,$1,$ what is the overall probability of error?

4.$4.$ Suggest two design improvements that would reduce error in this scenario.

5.$5.$ Develop new estimates of your THERP probabilities based on your design

improvements. What is the new overall probability of error?

6.$6.$ What level of error would you define as acceptable for this scenario? Why? Would your

acceptable level of error be different for the scenarios you did not choose?