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Operations > Final Exam > Flashcards

Final Exam Flashcards

1
Q

Supply chains are integrated group of processes to ____, ____, and ____ .

A

Source - Make - Deliver (Procurement - Production - Distribution)

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2
Q

What is the major objective of supply chain management?

A

Respond to uncertainty in customer demand without creating costly excess inventory

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3
Q

What are two negative effects of uncertainty?

A

Lateness and incomplete orders

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4
Q

How does inventory help mitigate the negative effects of uncertainty

A

It’s more or less insurance against supply chain uncertainty

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5
Q

When does the bullwhip effect happen?

A

Occurs when slight demand is magnified as information moves back upstream

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6
Q

Explain supply chain sustainability

A

All parts of the value chain have an impact on the environment - most of the impact comes from suppliers and consumers, so it’s important to focus on reducing the environmental impact before it comes to the factory and after it’s sold.

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7
Q

What is a pull system?

A

Inventory is held at suppliers and customer demand pulls product to them (Dell Inc.)

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8
Q

What is a push system?

A

Inventory is held as finished goods at the retailer, being pushed through the system to the consumer, regardless of demand (General Motors)

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9
Q

Give examples of Make-to-Stock items

A

Shoes, online courses

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10
Q

Give examples of Assemble-to-Order items

A

Dell computers, travel agent services

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11
Q

Give an example of Make-to-Order items

A

Ships, surgery

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12
Q

What are basic forms of forecast movement?

A

Trend, cycle, seasonal

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13
Q

What are 3 types of forecasting methods?

A

Time series, regression methods, qualitative

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14
Q

What does time series forecasting consist of?

A

statistical techniques that use historical demand data to predict future demand

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15
Q

What do regression methods of forecasting consist of?

A

attempt to develop a mathematical relationship between demand and factors that cause its behavior

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16
Q

What do qualitative methods of forecasting consist of?

A

use management judgment, expertise, and opinion to predict future demand (Example: Delphi Method)

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17
Q

What is a naive forecast?

A

Demand in current period is used as next periods forecast

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18
Q

What is a simple moving average?

A

Uses average demand for a fixed sequence of periods

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19
Q

When is it beneficial to use a simple moving average?

A

When you have stable demand with no pronounced behavior patterns

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20
Q

What is a weighted moving average?

A

Calculated by assigning weights to most recent data

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21
Q

How is forecast error calculated?

A

It’s the difference between forecast and actual deman

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22
Q

What does linear regression measure?

A

It relates a dependent variable to an independent variable in the form of a linear equation

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23
Q

How would you describe correlation?

A

It’s a measure of the strength of the relationship between independent and dependent variables

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24
Q

How would you describe correlation (r)?

A

It’s the strength of the relationship between x and y, and varies between -1.00 and 1.00 (inclusive)

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25
Q

How would you describe r^2?

A

r^2 tells us the level to which variation in our expected value is due to a variable x

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26
Q

What’s the goal of having inventory?

A

To keep a stock of items to have on hand to meet future demand.

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27
Q

What are the two general purposes of inventory management?

A
  1. Knowing how much to order and 2. knowing when to order
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28
Q

How does inventory relate to TQM?

A

Customers usually perceive quality service as availability of goods when they want them, so inventory must be sufficient to provide high-quality customer service in QM

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29
Q

What are the 4 types of inventory?

A

(1) Raw materials, components, and supplies, (2) work in process, (3) finished goods, (4) repair and replacement parts

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30
Q

What are 3 typical KPIs in measuring inventory

A

(1) Inventory turnover, (2) total value of inventory, (3) days of supply

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31
Q

What is fill rate in inventory management?

A

It’s the fraction of orders filled by a distribution center within a specific time period

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32
Q

What are the 3 most common inventory costs?

A

(1) carrying cost, (2) ordering cost, (3) shortage cost

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33
Q

What are carrying cost?

A

Cost of holding an item in inventory

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34
Q

What are ordering costs?

A

Cost of replenishing inventory?

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35
Q

What is a shortage cost?

A

Temporary or permanent loss of sales when demand cannot be met

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36
Q

What’s the difference between a continuous inventory system and period inventory system?

A

Continuous has to do with having an inventory system that is based on order quantity while period system is based on a time period.

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37
Q

What does EOQ stand for and what’s its primary goal?

A

Economic Order Quantity - it’s a continuous inventory system, which gives optimal order quantity that will minimize inventory costs

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38
Q

What are 4 assumptions about the basic EOQ model?

A

(1) Demand is known and consistent over time (2) no shortages are allowed (3) lead time or the receipt of orders is constant and (4) order quantity is received all at once

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39
Q

What does sequencing require?

A

It requires when several activities must be processed using a common resource

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40
Q

What are three criteria used in sequencing?

A
  1. Process-focused performance
  2. Customer-focused due date
  3. Cost-based
41
Q

What is makespan?

A

The time needed to process a given set of jobs

42
Q

What is flow time?

A

The amount of time a job spent in the shop or factory

43
Q

What is the difference in the two sequencing rules, SPT and EDD?

A

SPT - maximizes resource utilization and minimizes average flow time and work-in-process inventory. EDD - minimizes the maximum job tardiness and lateness

44
Q

What is Walter Shewhart famous for?

A

He developed control charts and introduced the term “quality assurance”

45
Q

What is W. Edwards Deming known for?

A

He developed courses during WWII to teach stats quality techniques to engineers and executives in military, and began teaching stats quality control to Japanese companies

46
Q

What is Joseph M. Juran famous for?

A

He followed Deming to Japan and focused on strategic quality planning

47
Q

What is Armand V. Feigenbaum known for?

A

Introduced concepts of total quality control and continuous quality improvement

48
Q

What is Philip Crosby known for?

A

Defined absolutes of quality management, conformance to requirements, prevention, and “zero defects”

49
Q

What is Kaoru Ishikawa known for?

A

Developed the “fishbone” diagram

50
Q

What does Demin’s Wheel illustrate?

A

PDCA Cycle - Plan, Do, Study/Check, Act

51
Q

Which quality tool focuses on location of problem in a process?

A

Flow Chart

52
Q

Which quality tool shows different categories of the problem?

A

Cause-and-Effect Diagram (fishbone)

53
Q

Which quality tool is considered a good root cause analysis tool?

A

5 Why

54
Q

Which quality tool tallies the number of defects from a list of causes?

A

Check Sheet

55
Q

Which quality tool is a frequency diagram of data for quality problems?

A

Histogram

56
Q

Which quality tool is best for identifying the typical causes for common quality problems?

A

Pareto Analysis

57
Q

Which quality tool allows us to see the relationship one variable has on another, and create a pattern to determine what the relationship looks like?

A

Scatter Diagram

58
Q

Which quality tool assumes process control with upper and lower limits?

A

Control Chart

59
Q

What is the point of ISO 9000:2000

A

It provides confidence to organizations and customers that quality requirements are fulfilled. It is international recognized and is a list of specific basic principles for initiating quality management systems.

60
Q

What’s Six Sigma’s goal?

A

To give managers a process for developing and delivering virtually perfect products or services

61
Q

Six Sigma is a measure of how much a process deviates from ________ .

A

Perfection

62
Q

What’s the defects rate goal of Six Sigma?

A

3.4 per million opportunities

63
Q

What would we consider a defect?

A

Any mistake or error that is passed on to the customer

64
Q

What would we consider a unit of work?

A

Output of a process or an individual process step

65
Q

How would you calculate defects per unit?

A

Divide the number of defects discovered by the number of units produced

66
Q

In manufacturing, we use the term ‘defects’ per million opportunities, but what term do we use in service industries?

A

‘errors’ per million opportunities

67
Q

What is DFSS (Design for Six Sigma)?

A

A systematic approach to designing products and processes that will achieve Six Sigma

68
Q

What is it sometimes more beneficial to use Design for Six Sigma?

A

It’s a more effective and less expensive way to achieve Six Sigma

69
Q

What does cost of quality refer to?

A

The costs associated with avoiding poor quality or those incurred as a result of poor quality.

70
Q

What are the 4 cost of quality measurements?

A
  1. Prevention costs
  2. Appraisal Costs
  3. Internal-failure costs
  4. External-failure costs
71
Q

What are prevention costs? What’s and example?

A

Costs that help prevent nonconforming goods and services to be sold to a customer (example: training costs)

72
Q

What are appraisal costs? What’s an example?

A

Costs that are made on figuring out the quality levels through measurement and analysis of data to detect and correct problems (example: test and inspection for incoming materials)

73
Q

What are examples of internal- and external-failure costs?

A

Internal = scrap/rework and external = product liability

74
Q

Which two types of costs fall under costs of conformance?

A

Prevention and appraisal, because they are all about making sure products are to quality before they’re made

75
Q

Which two types of costs fall under costs of nonconformance?

A

Internal and external failure costs because they happen after a product is made

76
Q

What is the aim of Poka-Yoke

A

to design the process so that mistakes can be detected and corrected immediately, eliminating defects at the source

77
Q

What was Poka-Yoke first applied by?

A

Shigeo Shingo in the 1960s

78
Q

What does Statistical Process Control (SPC) do?

A

monitors production process to detect and prevent poor quality

79
Q

How do control charts help us in SPC?

A

They show us where statistical control limits are

80
Q

What is random process variability generally due to?

A

Generally, natural occurances: It’s inherent in a process and depends on equipment/machinery/operator

81
Q

What is non-random process variability generally due to?

A

Special cases: We can identify and correct them, includes equipment out of adjustment, defective materials, changes in parts, broken machinery, etc.

82
Q

What’s the difference between attribute and variable quality measures?

A

Attribute: evaluated with discrete response (good/bad, yes/no). Variable: Is continuous (weight, length)

83
Q

What are the best places to implement control charts?

A

Before production, before a costly/irreversible point, after assembly, before leaving factory

84
Q

What are lean operating systems?

A

Manufacturing and service operations that apply the principles of lean enterprise

85
Q

What is Muda?

A

It means waste in Japanese, and helps companies eliminate it by looking for non-value added waste

86
Q

Lean vs. Six Sigma

A

Lean focuses on hidden waste reduction (the elimination of non-value added steps), Six Sigma focuses on the elimination of process variance through data driven decisions

87
Q

What is value stream mapping?

A

a lean-management method for analyzing the current state and designing a future state for the series of events that take a product or service from its beginning through to the customer

88
Q

What is the goal of VSM?

A

to identify and reduce waste in the process

89
Q

What is a key metric associated with value stream mapping?

A

Lead time

90
Q

What does OEE Stand for and what does it mean?

A

Overall Equipment Effectiveness - it’s a good lean indicator and metric for productivity and relates to the Six Big Losses

91
Q

What are the Six Big Losses?

A

A. Downtime (breakdowns and set-up and adjustment B. Speed Losses (idling and reduced speed C. Defect (scrap/quality and reduced yield)

92
Q

How do you calculate OEE?

A

Availability (downtime) x performance (speed) x quality

93
Q

What is Kaizen?

A

Focuses on continuous improvement, instead of making leaps every now and then it is better to have smaller improvements along the way

94
Q

What are the 5’s?

A

Sort, set in order, shine, standardize, sustain

95
Q

What is Kanban?

A

self-regulating scheduling system for Lean/JIT Production

96
Q

Who was Kanban originally developed by?

A

Taiichi Ohno at Toyota in 1947

97
Q

What does TPM stand for and what is it?

A

Total Productive Maintenance - it is an overall approach to continuous improvement (zero accidents, zero defects, zero breakdowns)

98
Q

What is SMED?

A

Single-Minute Exchange of Dies - to cut time spent idling machines

Operations (3 decks)

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