esc101-20089-lecture-5-bw-small

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Unformatted text preview: ESC101 – Engineering Science Praxis I – 20089 Lecture 5 Processes / Plans / Requirements Jason Foster & Rob Irish So about the next few weeks… Logistics This week • In-Studio presentations (1 hour commitment) Week of 10-12 • No Lecture or Studios (Labs run as normal) (+ Writing return) (CIV102 Submission) Week of 10-19 • In-Studio consultations Week of 10-26 • In-Studio presentations Processes … heuristics, and plans. Lecture 4 Lecture 4 Why were these 12 steps chosen? This process was developed by three Faculty members while writing their design textbook Each step was an activity that their students neglected to perform Process is an embedded reaction to prior stupidity – Clay Shirky • American professor and consultant • Expert on social networking • Highly sought after speaker and teacher http://upload.wikimedia.org/wikipedia/commons/4/45/Clay_Shirky.jpg Before writing last week, did you write out a skeleton or plan? (A)Yes. (B)No. Why? “Midterm” “Midterm” “Midterm” Why Plan? • Structures and organizes thoughts • Promotes efficiency (by eliminating redundancies) • Provides a communication framework • Guides allocation of resources • Enables the evaluation of progress Says nothing about “effectiveness” • Structures and organizes thoughts • Promotes efficiency (by eliminating redundancies) a communication framework • Provides and others (management?) By self • Guides allocation of resources • Enables the evaluation of progress Why Plan? Says nothing about “effectiveness” • Structures and organizes thoughts • Promotes efficiency (by eliminating redundancies) a communication framework • Provides and others (management?) By self • Guides allocation of resources • Enables the evaluation of progress • Learn from others’ mistakes • Ensure a “good” or “complete” plan • Promote deterministic outcomes • Guide reflection • C.Y.A. (e.g. ensure a legal defense) • ??? Why Plan? Follow a Process? Says nothing about “effectiveness” • Structures and organizes thoughts • Promotes efficiency (by eliminating redundancies) a communication framework • Provides and others (management?) By self • Guides allocation of resources • Enables the evaluation of progress Learn others’ mistakes •Is suchfrom management appropriate? risk • Ensure a “good” or “complete” plan • Promote deterministic outcomes • Guide reflection • C.Y.A. (e.g. ensure a legal defense) ??? Note that this keeps coming up! • Why Plan? Follow a Process? A process should be… (A)… followed. (B) … used. (C)… adapted. (D)… learned from. (E) … adhered to. Lecture 3 Lecture 3 Factors of Safety • Double the estimated requirements. Rules of Thumb and Orders of Magnitude • One gram of U238 gives one MW•day of energy. • The yield strength of a material is equal to a 0.02% offset on the stress-strain curve.! Resource Allocation Heuristics! • At some point in the project, freeze the design. • Allocate resources as long as the cost of not knowing exceeds the cost of finding out. Risk-Controlling Heuristics! • Make small changes in the state-of-the-art. • Always give yourself a chance to retreat. Attitude-Determining Heuristics • Always give an answer. • Work at the margin of solvable problems. • Know the answer before seeking the answer. George Pólya Dec. 13, 1887 – Sept. 7, 1985 George Pólya Process Dec. 13, 1887 – Sept. 7, 1985 Heuristics •Use symmetry •Consider special cases •Draw a picture •Work backward •Use a model •... 1 Understand the problem 2 Devise a plan 3 Carry out the plan 4 Review/Extend Jason’s Metaphor One of these years it’ll work! Golem (Prague) Borg (Locutus) Unthinking, unreflective, adherence to a predetermined, fixed set of actions. Splints MacGyver JTF-2 Flexible, reflective, tailored adaptation to context and circumstances. 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Requirements Let’s add some formalisms "5'67)#'>$??':-'#7-'.#2-0@#7.'/4'&/,2' 0->'#-)9< 85'67)#'>$??':-'"7)??-0@-.'$0'&/,2' 0->'#-)9< -5'67)#'-%$8-0"-'>$??'.7/>'&/,2' .#2-0@#7.')08'#7)#'&/,2' "7)??-0@-.')2-':-$0@')882-..-8< Studio 4 @-0-2)# ;/..$:?).'&/,'" >$#7'4/2 :2$8@- !"#$%$#&'A'B C$2.#' D-)9'EF-2"$.- G0')'.$0@?-';)@-H' @-0-2)#-').'9)0&' ;/..$:?-'2-I,$2-9-0#.' ).'&/,'")0'"/9-',;' >$#7'4/2')';-8-.#2$)0' :2$8@- We laugh, but in the modern engineering world security is a design requirement =/9->/2J'* D-)9'!..$@09-0# D-)9'!..$@09-0# !" #$%&'$%('($)*$+,(-+./(0%'1)$'*2%( ,$+.%$+'(.3(%4'2)'.%(5%1+67(38('( &%5%1.$+'7(*$+56%( 9" #$%&'$%('(:(0+7).%(&$%1%7.'.+37( ./'.(+7,2)5%1; < #$%1%7.'.+37(38('(&%5%1.$+'7( … something that must be met. *$+56%(+7(=3$37.3(>3)(/'4%(83)75( '75(&/3.36$'&/%5 …< something that must be avoided. ?@&2'7'.+37(38(./%(.>&%(38(*$+56%( A*%'0B(.$)11B(1)1&%71+37B('$,/B( … the singular form of “criteria”. %.,C"('75(/3-(>3)(5%.%$0+7%5( ./+1 … something that lets you compare < ?4'2)'.+37(38(./'.(*$+56%()1+76( … none of the above. >3)$($)*$+, A criterion is… (A) (B) (C) (D) (E) designs. Studio 4 Studio 4 Studio 4 Studio 4 Studio 4 Studio 4 Studio 4 Factor of Safety = 2.5 Aesthetics Angled Floor Side Windows Canopy Support Load Safety Handrails No Deformation Cost Width Wheelchair Ramp Strong Maintenance Fireproof Rigid Lit at Night Accessible Durable Wheelchair Accessible Wheelchair Ramp / Lift Lecture 1 2008 http://ecx.images-amazon.com/images/I/41Jrgul90dL.jpg http://www.amazon.com/Universal-Design-Handbook-Wolfgang-Preiser/dp/0071376054/ Effective Accessible Universally Accessible Wheelchair Accessible Efficient Wheelchair Ramp / Lift Effective Greater control in Designer’s hands Greater risk to Client Accessible Means of conveying Universally Accessible wheeled or bulky items from Accessible ground Wheelchair level to the deck Efficient Greater risk Ramp Wheelchair to Designer / Lift Greater control in Client’s hands Factor of Safety = 2.5 Aesthetics Angled Floor Side Windows Canopy Support Load Safety Handrails No Deformation Cost Width Wheelchair Ramp Strong Maintenance Fireproof Rigid Lit at Night Accessible Durable Build to code, and in most cases all of the CIV102 requirements will be met So why take CIV102? Lecture 4 You laugh… but think back to your CIV102 lectures! About a 3 year gap between disaster and codified response Factor of Safety = 2.5 Aesthetics Angled Floor Side Windows Canopy Support Load Safety Handrails No Deformation Cost Width Wheelchair Ramp Strong Maintenance Fireproof Rigid Lit at Night Accessible Durable Factor of Safety = 2.5 Aesthetics Angled Floor Side Windows Canopy Support Load Safety Handrails No Deformation Cost Width Wheelchair Ramp Strong Maintenance Fireproof Rigid Lit at Night Accessible Durable Wheelchair Ramp Cost Safety Accessible Aesthetics Wheelchair Ramp Functional Safety Cost Accessible Aesthetics Non-functional 15th IEEE International Requirements Engineering Conference 15th IEEE International Requirements Engineering Conference !"#$%"&'(")*+%",-#./0(+1/2/"*3# !"#$%"&'(")*+%",-#./0(+1/2/"*3# ! ! 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This note was uploaded on 01/10/2011 for the course ESC 101 taught by Professor Irish during the Fall '08 term at University of Toronto- Toronto.

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