Cost Analysis and Estimating - Anvari.Net · Cost Analysis and Estimating for Engineering and...
Transcript of Cost Analysis and Estimating - Anvari.Net · Cost Analysis and Estimating for Engineering and...
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Ch 2-1
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Cost Analysis and Estimatingfor Engineering and Management
Chapter 2
Labor Analysis
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Ch 2-2
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Overview
�Labor and Labor Costs−Determining Costs−Labor Hour
�Time Study�Work Sampling�Wages and Fringe Benefits
−Incentive Pay
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Ch 2-3
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Labor
�Direct Labor−“Touches” the Product−Changes – Adds Value to the Product
� Indirect Labor−Supports Direct Labor Efforts
�Direct Labor Accounts for About 15%of the Product Cost
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Ch 2-4
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Labor Costs
�Worker Pay−Wages
−Fringe Benefits
�Equipment Costs−Capital Cost
−Operating Costs
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Ch 2-5
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Determining Costs
�Products in Production−Historical Cost Records−Measurement of Time−Clock Time vs. Productive Time
�Proposed Products−Need an Estimate
�Labor Cost = Time x Wage
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Ch 2-6
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Labor Hour
�One Worker Working for One Hour�Labor Year
52 Weeks x 40 Hours = 2080 Hours
�Labor Month2080 / 12 = 173.3 Hours
�Should BeTime Working NOT Time at Work
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Ch 2-7
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Motivation
� Incentive Pay−More Production = More Pay−Requires “Fair” Standards−Leads to Other Problems
� Non-Incentive−Still Need to Know How Much Time a JobShould Take (Standard Time)
� Standards Are Needed for Estimates
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Ch 2-8
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Ergonomics
�Medical, Psychological & Engineering
�Human / Machine / Operation Interface
�Repetitive Motion Injury
�Legal and Moral Issue
�Financial IssueInjury Prevention Costs Less than Injuries
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Ch 2-9
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Time Study
� Founder and Pioneers−Frederick W. Taylor
−Frank & Lillian Gilbreth� Movie “Cheaper By the Dozen”
� Composed of 2 Parts−Analyze and Optimize the Operation
−Measure the Time and Compute the Standard
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Ch 2-10
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Advantages of Time Study
�System for Estimating Costs
� Justification for Methods Improvement
�Reduction of Operation Costs
� Improvement of Engineering Design
� Information for Managing Productivity
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Ch 2-11
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Procedure for Time Study
✑✎ Methods Analysis and Improvement
✒✎ Record Info. About the Operation
�✎ Separate Operation into Elements
✔✎ Record Time for Elements
✕✎ Rate Performance
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Ch 2-12
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Procedure for Time Study
✖✎ Convert to Normal Time
✗✎ Determine Allowances
✘✎ Calculate Standard Time
✙✎ Express Standard Time inAppropriate Terms
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Ch 2-13
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Methods Analysis
� Is the Job Ready for Timing?−Is the Physical Set-up Correct?
−Is the Layout Efficient?
−Are the Proper Tools & Equip. Used?
−Is the Product Produced Correctly?
−Is the Motion Pattern Optimized?
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Ch 2-14
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Recording of Information
�Sketch Process Layout
�List Elements−Short as Possible (but Time-able)
−Have Identifiable Start & End Points
−Separate Operator & Machine Elements
−Separate Constant & Variable Elements
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Ch 2-15
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Example of Layout Sketch
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Ch 2-16
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Taking the “Time Study”
�Stopwatch−Continuous vs. “Snap-Back” Methods
�Performance Rating−Trained Observer−Subjective Comparison−Observed Operator to Typical OperatorWorking at Normal Circumstances
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Ch 2-17
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Allowances
�Personal
�Fatigue
�Delay
�Together PF&D (in Percent)
�Convert to Factor
PF&D%
%Fa −
=100
100Eq 2.2
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Ch 2-18
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Analyzing the Study
�Find Average Time for Each Element
�Multiply by Performance Rating toObtain “Normal Time”
�Multiply by Allowance Factor to Obtain“Standard Time”
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Ch 2-19
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Time Study Example Part 1
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Ch 2-20
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Time Study Example Part 2
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Ch 2-21
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Time Study Example Part 3
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Ch 2-22
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Work Sampling
�Used for General Purposes:−Estimating Costs
−Scheduling
−Labor Requirements
−Monitoring and Managing Performance
�Statistical Technique
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Ch 2-23
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Compared to Time Study
�Multiple Workers / Machines
�Study Large Area
�Can Handle Long Cycle Times
�Less Study Time Required (Lower Cost)
�Less Disruptive of Work
�Reduces Performance Issues
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Ch 2-24
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
About Work Sampling
�Determines Proportion of Time Spenton Predetermined Activities
�Based on Probability & Statistics−Random, Discrete Observations
−Sufficient Number of Observations
−Representative of Distribution ofPopulation
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Ch 2-25
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Fundamentals�Proportion of Time Spent on Activity i
P’i = Ni / N Eq 2.6�Need to Know (Assume or Specify)
−How Close Does P’i Need to Be to Pi
−How Confident Do We Want to Be Thatthe Sample Interval Encompasses theActual Value
�Need to Determine Z for the DesiredConfidence from the Statistics Table
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Ch 2-26
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Normal Curve
Fig. 2.4
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Ch 2-27
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Values for Z†
AreaBetween
Limits (%)
-Z to+Z
AreaOutside
Limits (%)6 8 ±±±±1.000 3 2
9 0 ±±±±1.645 1 0
9 5 ±±±±1.960 5
9 9 ±±±±2.576 1†
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Ch 2-28
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Preliminary Sampling
�Uncovers Potential Problems
�Refines Activity Definitions
�Helps “Sell” the Sampling Study
�Provides an Estimate for P’i
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Ch 2-29
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Determining Sample Size
�Obtain Z for Desired Confidence
�Determine Confidence Interval I
�Estimate Sample Proportion P’i
�Compute Ni for Each Activity
�Select the Largest Ni as N for theComplete Study
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Ch 2-30
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Calculating Ni
( )
142
''2
I
ppZN ii
i−
= Eq 2.9
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Ch 2-31
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Conducting the Full Sampling
�Spread the N Observations EvenlyOver the Study Days
�Distribute Each Day’s ObservationsRandomly through the Day
�Determine Rating and PF&D Factors�Obtain the Total Units Produced
During the Study (Np)
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Ch 2-32
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Standard Time
�Compute the Standard Time−Do Not Include Idle Activities
( ) ( )p
is N
DPFHRNNH
&1/ += Eq 2.10
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Ch 2-33
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Considerations for Sampling
�Explain and Sell Prior to Starting
�Appropriately Isolate Studies
�Use as Large a Sample Size as Practical
�Observe at Random Times
�Conduct the Study Over a Long Period
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Ch 2-34
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Other Methods to Determine Time
�Labor Hour Reports/Time Cards/JobTickets−Objective: Time Job SHOULD Take
−Span Time Records Only
−Requires “Adjustment”
−Collected into Labor-Hour Summary
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Ch 2-35
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Other Methods to Determine Time
�Similar Products−Use Actual Data
−Decompose Times by ComponentsReassemble Times for New Product
−Can Ratio Actual Times by Ratio ofProduct Complexities
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Ch 2-36
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Other Methods to Determine Time
�Engineering Performance Data−Micro-Motion Systems (e.g. MTM)
−Some Capable of Producing Standards
� In-House Systems
�Experience and Judgment
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Ch 2-37
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Wages
�Wage –−Money Paid for an Amount of Work
−Usually for Direct Labor
−Sometimes for Indirect Labor
�Salary –−Money Paid for a Given Period of Time
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Ch 2-38
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Fringe Benefits
�Additional Costs to Company
�For Employees
�Required by Law, Contract, Agreement
�Can Be Included in Hourly Rates
Or
�Covered in Overhead
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Ch 2-39
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Determining Wages
�Wage Only
�Gross Hourly Cost−Wages and Fringe Benefits Costs
�Wage Only Calculation−Based on Time in Attendance
Cdl = Ha x Rh Eq 2.11
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Ch 2-40
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Incentive Wages
�Pure Incentive−(e.g. Working on Commission)
Cdl = NpRp Eq 2.12
� Guaranteed Wage Plus Incentive
Cdl = HaRh + Rh(HsNp – Ha) Eq 2.13
�Minimum Cdl = HaRh
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Ch 2-41
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Efficiency
�Ratio of Standard Hours Produced toActual Hours Worked
�Measure of Labor Efficiency orProductivity
100×=a
sp H
HNE Eq 2.14
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Ch 2-42
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Gross Hourly Cost� Wages Plus Fringe Benefits Costs� Detailed Calculations Required
−By Engineering−Or (Preferably) Accounting
� Fringe Costs Include:−Legally Required Employee Costs−Contractual Costs−Voluntary Program Costs−Costs for Time Paid but Not Worked
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Ch 2-43
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Legally Required Costs
�Social Security−Employer’s Contribution7.65% of First $87,000 (as of 2003)
�Medicare−Employer’s Contribution1.45% of All Wages Paid
�Click for Current Rates
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Ch 2-44
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
More Legal Requirements�Worker’s Compensation
−Income for Worker Who Cannot Work Dueto Injury on the Job
�Unemployment Insurance−Pays Workers Laid Off Through No Faultof Their Own
�Non-Exempt Time-and-a-Half Pay−Over 8 Hours/Day and/or 40 Hours/Week
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Ch 2-45
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Other Fringe Costs
�Supplemental Medical Insurance−All or a Portion of the Premiums
−Can Be Around $500/Month ($2.89/Hr)
�Life Insurance Premiums
�Disability Insurance Premiums
�Supplemental Pension
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Ch 2-46
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Pay for Time Not Worked
�Vacation, Holidays, Sick Pay−Amount of Pay for this Time IsApportioned Over Total Hours in
the Work Year
−Added to Wage Rate
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Ch 2-47
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Joint Labor Costs
�More Than One Product Produced ByCommon Labor
�Common Production Up to a SplitPoint
�Common Labor Costs Need to BeApportioned to the Different Products
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Ch 2-48
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
(De)Jointing Labor Costs
�Determine a Common Metric�Find a Proportional Relationship for the
Products�Apply the Same Proportions to the Costs�Market Effects/Strategy Can Distort
−Some Products Subsidize Others−Price Is Not Proportional to Cost
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Ch 2-49
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Learning
�First Units Produced Take Longer
�Familiarization with the Job ReducesTime
�Predictable
�Covered in Chapters 6 & 8
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Ch 2-50
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Learning
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Ch 2-51
© 2004 Pearson Education, Inc.Pearson Prentice Hall, Pearson Education, Upper Saddle River, NJ 07458Ostwald and McLaren / Cost Analysis and Estimating for Engineering and Management
Summary�Definitions Relative to Labor Costs�How to Determine Time for the Job
−Time Study−Work Sampling−Other
�Finding the Labor Cost Rate−Wages, Fringe Benefits,Gross Hourly Cost