Requirements – Essential To Robust Product Design

1. Requirements – Essential To Robust Product Design Definition: “Statements of desired product performances and features used to define and quantify a product design” • User Level: Special list of Requirements which state the intended application and/or purpose of the product (Labeling) • Product Level: State all features, performances, and interfaces describing the product in “Engineering Terms” • Block Level: State all features, performances and interfaces describing the block in “Engineering Terms” • User Level >>> Validation • Product & Block Level>>>Verification Efficient Engineering teams fully specify before they design !!

2. Requirements Imply Proof of Satisfaction !Implied Product Design Integrity ! • Many Gov’t Agencies mandate that ALL product requirements should be user validated and/or engineering verified (tested or justified). A requirement which cannot be verified or validated should not be stated unless objective evidence can be compiled to prove its satisfaction • Other Requirement Categorization Used in this Course: • Standard: Common to ALL Project Teams • Performance: Unique to Project and Technology, For Differentiating Standard Reqs Enhance Consistency across Projects

3. Blocks • Complex products require that the design be broken into logical design elements (termed blocks in this course) • During phase 1, your product design must include a brief list of user level reqs plus a robust list of product level reqs as well as a block diagram of all the logical design elements • Blocks form the basis of standardized design elements in this course. Each project must provide one or more design blocks for each team member.

4. Allocation and Association • ALLProduct Level Requirements Must be allocated or associated to each design block within the project to complete Phase 1 • Allocated: % of total budgeted to applicable design blocks plus margin. For example: Product Cost, Power Consumption, Mass …. • Associated: Used when allocation is not applicable. For example: Country(s) of Market, Annual Volume, Safety Standards ….

5. Standard Requirements • Standard Requirements are those requirements which are universal and can be applied to nearly all products and hence final projects • Standard Requirements may or may not be differentiating depending upon project goals but MUST be part of the minimum description of the product

6. Standard Requirements: Market Choose & Understand your Market “before” …………. you design a product RequirementUnits to Specify • Company Name(s), Model#(s) • Total $/Region, Info Source • $/unit as sold to customers • List of Countries or Regions • Min/Max Age, Sex, Restrictions • Ind, Auto, Home, Wearable, etc • $/unit in proto production • $/unit in volume production • # of units/yr • Competitors • Market Size • Min List Price • Market Geography • Market Demography • Intended Application • Max Proto Cost • Max Product Cost • Annual Volume

7. Standard Requirements: Env & Safety Consider Simultaneous Min or Max CasesSome will NOT be “testable” RequirementUnits to Specify • Co, Min-Max • Rh%, Min-Max • Meters or ATM, Min-Max • Co, Min-Max • Rh%, Min-Max • Meters/ATM, Min-Max • Time • List of IEC, and FCC stds • List UL, IEC or other stds • Min Oper Temp Range • Min Oper Humidity Range • Min Oper Alt or Press Range • Min Storage Temp Range • Min Storage Humidity Range • Min Storage Alt/Press Range • Max Storage Duration • Primary EMC Standards • Primary Safety Standards

8. Standard Requirements: Power Must consider power source(s) early Undefined DC power sources NOT allowed RequirementUnits to Specify • AC,Battery,Photovoltaic,Gen… • Permanent or Temp • Volts, Min-Max For each Source • Watts Total, Per Source • Watt-Hours/Yr for AC Time for Min Battery Life • Energy Sources • Source Connection • Min Operating Voltage Range • Max Power Consumption • Max Energy Consumption

9. Standard Requirements: Mechanical Package and Mechanical Design Impact Many Product Aspects RequirementUnits to Specify • Cm3 Total for Entire Product • Cm Max LxWxH for 1 unit • Kilograms • Type or Style • # • Cm2 Total • G force (Grms), # Reps • Max Volume • Shipping Container Size • Max Mass • Power Connector(s) • Max # of PC Bds • Max PCB Circuit Area • Max Shock

10. Standard Requirements: Mfg & Life Cycle Product designs should consider full “life cycle” from Mfg process to Disposal RequirementUnits to Specify • # Total Parts incl elec & mech • # of Unique Parts • $ (Parts+Mfg=Product Cost) • $ (Parts+Mfg=Product Cost) • Time = MTBF(yrs) • Time (yrs) • Return, Recycle, Dispose, etc • Time (yrs) • Dispose or Repair, Factory or Field • Max Parts Count • Max Unique Parts Count • Parts/Mat $ Allocation • Asm/Test $ Allocation • Product Life, Reliability • Full Warranty Period • Product Disposition • Production Life Support • Service Strategy

11. Project Proposal: Performance Requirements • Performance Requirements are those requirements which are specific to a product and project • Performance Requirements differentiate the product from all other similar products • Performance Requirements describe …. • Interfaces • Features, Options • Modes of Operation • Performance Parameters • User Controls • User Displays and Outputs

12. Mandatory: Performance Requirements(Must be Considered if Applicable) All Applicable Must Be Defined RequirementDefinition • Country Usage (AC) • Battery Style, Time • Min to Max Hz • Type, Size, Visibility, Speed, Color • Volume, Pitch, Duration, Vibration, Flags, Other • Analog, Digital, Keybds, Voice, RF, etc • Nominal Input Power Sources • Battery Type, Min Life • Input Power Freq Ranges • Optical Indicators, Displays • Mechanical Indicators • User Inputs

13. Mandatory: Performance Requirements(Must be Considered if Applicable) There may be others RequirementDefinition • Voltage, Current, Frequency, Noise, Impedance, Field Strengths, Standards, etc • Attachments, Pressure, Torque, Handles, Connector Types, Package, etc • On/Off, Idles, Resets, Standby, Xmit, Charging, etc • Accuracy, Resolution, Speeds, Distances, Errors, Noise, Distortion, etc • Electrical Interfaces • Mechanical Interfaces • Operational Modes • Effectiveness