L04 Slide 14 Example 2 Source Dyson Inc Dyson Airblade dryer aluminum Dyson

L04 slide 14 example 2 source dyson inc dyson

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L04 Slide 14 Example 2 Source: Dyson Inc. Dyson Airblade dryer, aluminum Dyson Airblade dryer, plastic XLERATOR dryer Cotton roll towels Paper towels, virgin Paper towels, 100% recycled
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L04 Slide 15 Effect of Product Lifetime Usage Source: Dyson Inc.
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L04 Slide 16 Effect of Altering Manufacturing Phase Grid Mix
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L04 Slide 17 Effect of Use Intensity Source: Dyson Inc.
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L04 Slide 18 Example 3: Light Bulbs Operating Cycle (On/Off Cycle of Lamp)
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L04 Slide 19 Consistency Check Are differences in data quality consistent with goal & scope ? Temporal and geographical differences applied consistently? Has the system boundary been applied consistently? Have the impact assessment methods been applied consistently?
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L04 Slide 20 Consistency Check Source: Dyson Inc.
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L04 Slide 21 Comparison with Literature Source: Dyson Inc.
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L04 Slide 22 Conclusions Recommendations Limitations Which option is recommended and why? Recommendations should be based on final conclusions Reflect the stated desires of the client
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Estimation
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L04 Slide 24 “It is the mark of an instructed mind to rest satisfied with the degree of precision which the nature of the subject permits and not to seek an exactness where only an approximation of the truth is possible”
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L04 Slide 25 What is Estimation A mix of qualitative and quantitative approaches A “back of the envelope” or “ball park” assessment to a question An educated guess or opportunistic problem solving A structured approach of creating and documenting assumptions Adjust your expectations and those of your audience
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L04 Slide 26 Estimation Methods Guidelines from experience Proxies or Similarity Use data that we have for a similar situation (e.g. substituting methane value for natural gas value) Small linear models Scale based on known values Segmentation Break the population into subgroups and estimate each group Bounding Scale based on limits Triangulation create models with different approaches and compare results
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L04 Slide 27 Attributes of Good Assumptions Have some basis in known facts or experience Clarify and simplify the analysis Unbiased e.g. comparing gasoline and electric cars: use electricity from the jurisdiction relevant to your client Not a shortcut You will lose credibility if you use assumptions for readably available information Justify your assumptions
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