analysis

BBA312 DECISION ANALYSIS Final Assignment Task brief & rubrics

Task

Students are required to develop a report addressing the specific exercises set out in the guideline below. Your report should be 2000-2500 words, excluding

Title, Abstract, Table of contents, Bibliography and Appendices.

Exercise 1. (50%)

An important part of a production line has to be repaired. The industrial company is impacted by the stop of the production. Each day without producing costs

the company $64 000. The maintenance team has only three possible options:

Option 1

He can return the part to the supplier who has agreed to collect, repair, and return it for free. However, there is no compensation for any losses supported by the

company because the machine is not working. The supplier will not agree to repair the machine if there has been a previous attempt to repair it. If the machine is

returned, the supplier will guarantee to return it in working order in 5 days’ time.

Option 2

He can call in a repairing company. They will charge $40 000 to carry out the repair and they estimate that there is a 20% chance that they will be able to return

the machine to working order in 2 days. There is, however, a 80% chance that repairs will take 4 days.

Option 3

The maintenance team can attempt to repair it. He estimates that there is a 40% chance that he could mend the machine in 4 days. However, if at the end of 4

days the attempted repair has not been successful, he will have to decide whether to call the repairing company or to make a second attempt to repair. This would

take 3 further days, and he estimates that there is a 35% chance that this second attempt would be successful. If he fails at the second attempt, he will have no

alternative other than to call in the repairing company.

(a) Draw the decision tree of this problem

(b) Assuming that the maintenance department wants is to minimize the expected costs, what policy should they follow?

Exercise 2. (50%)

The company ABC is one of the most important specialists in electronic products.

In the last weeks there are several customers’ complaints due to the poor quality.

One of the Operations Managers starts a Quality Control to detect the possible problems.

After one week, the most common defects and their frequency are in the following table:

Defects DAYS

1 2 3 4 5 6 7

1 Too long 65 50 12 24 55 23 28

2 Bad quality material 21 32 14 11 20 18 10

3 Wrong labelling 3 3 1 2 0 4 5

4 Broken 0 3 0 3 0 3 0

5 Wrong date 20 16 15 20 18 16 18

6 Wrong packaging 0 8 0 4 3 4 5

7 Lack of components 17 11 12 10 17 19 24

8 Too short 1 0 4 0 4 2 3

9 Excess of components 69 57 58 55 62 59 65

10 Wrong components 5 1 7 2 4 6 1

TOTAL DEFECTS

(a) Draw the control chart that shows the evolution of the rate U= defects/unit (in %) in one week. If the same number of units are checked every day and

the goal is 1.5%, are we achieving the expectations?

(b) Construct the Pareto Chart and sort the defects in three groups according to the frequency.

One of the most common problems is related to the length of the product. A sample of 50 units (10 groups of 5 elements) is taken.

If the specification is 10+0.5, do you think that the process is making parts longer than usual?

1 2 3 4 5 6 7 8 9 10

10 10.1 10.2 10.2 10 10.3 10.2 10.1 10 10.3

10.2 10.3 9.9 9.8 10.1 10.2 10 10.1 9.9 10.1

10.3 10 10.1 10 10.2 10.1 10.1 10 10.3 10

9.8 9.9 10.3 10.1 10 10.4 9.8 10.1 10.1 10.2

10.1 10.2 10.4 10 9.9 9.7 10 9.8 10.4 9.9

(c) Compute the average of data, draw the control chart of the 10 groups and the histogram of 50 units to justify your answer.

Checking for possible causes that explain the problem, the manager concludes that the machinery is old, and the maintenance is poor.

(d) Suggest an Action Plan with several solutions to fix the problem.

Formalities:

• Word count: 2000-2500 words

• Cover, Table of Contents, References and Appendix are excluded of the total word count.

• Font: Arial 12,5 pts.

• Text alignment: Justified.

• The in-text References and the Bibliography have to be in Harvard’s citation style.

Submission:

• Week 12: Via Moodle (Turnitin).

• Deadline: 08th January 2023 at 23:59 CEST.

Weight: This task is a 60% of your total grade for this subject.

Rubrics

Exceptional 90-100

Good 80-89

Fair 70-79

Marginal Fail 60-69

Knowledge & Understanding (20%)

Student demonstrates excellent understanding of key concepts and uses vocabulary in an entirely appropriate manner.

Student demonstrates good understanding of the task and mentions some relevant concepts and demonstrates use of the relevant vocabulary.

Student understands the task and provides minimum theory and/or some use of vocabulary.

Student understands the task and attempts to answer the question but does not mention key concepts or uses minimum amount of relevant vocabulary.

Application (30%) Student applies fully relevant knowledge from the topics delivered in class.

Student applies mostly relevant knowledge from the topics delivered in class.

Student applies some relevant knowledge from the topics delivered in class. Misunderstanding may be evident.

Student applies little relevant knowledge from the topics delivered in class. Misunderstands are evident.

Critical Thinking (30%) Student critically assesses in excellent ways, drawing outstanding conclusions from relevant authors.

Student critically assesses in good ways, drawing conclusions from relevant authors and references.

Student provides some insights but stays on the surface of the topic. References may not be relevant.

Student makes little or noncritical thinking insights, does not quote appropriate authors, and does not provide valid sources.

Communication (20%) Student communicates their ideas extremely clearly and concisely, respecting word count, grammar and spellcheck

Student communicates their ideas clearly and concisely, respecting word count, grammar and spellcheck

Student communicates their ideas with some clarity and concision. It may be slightly over or under the wordcount limit. Some misspelling errors may be evident.

Student communicates their ideas in a somewhat unclear and unconcise way. Does not reach or does exceed wordcount excessively and misspelling errors are evident.