Technical Requirement Detail(2) Formulation of metric May be marginal,absolute,probabilistic =X%improvement in =x value of =X value of with 90%of probability Traditional metric is based on benefit/performance Current practice of metric is based on benefit/performance and cost "Ideal"would be metrics which include benefit/performance,schedule,cost and risk CLGO System Engineering by J.J.Gao 16
+ - Formulation of metric May be marginal, absolute, probabilistic =X% improvement in__________ =x value of _____________ =X value of ________ with 90% of probability Traditional metric is based on benefit/performance Current practice of metric is based on benefit/performance and cost “Ideal” would be metrics which include benefit/performance, schedule, cost and risk System Engineering by J. J. Gao 16 Technical Requirement Detail(2)
What are the requirements for? AUTOMOBILE Automobile sun roof windshield quarter window outside mirror indshield wiper roof post hood Data link? grill window head light door handle bumper door license plate outside mirror ■Copy Machine ndicator light shield front wheel hub cap Dishwasher ■Helicopter ■www Web site CLGO System Engineering by J.J.Gao 17
+ - Automobile Data link? Copy Machine Dishwasher Helicopter www Web site System Engineering by J. J. Gao 17 What are the requirements for?
Attributes of Acceptable Requirements A complete sentence with a single shall"per numbered statement Characteristics for Each Requirement Statement: Clear and consistent-readily understandable Correct-does not contain error of fact Feasible-can be satisfied within natural physical constraints,state of the art technologies, and other project constraints Flexibility-Not stated as to how it is to be satisfied Without ambiguity-only one interpretation Singular-One actor-verb-object requirement Verify-can be proved at the level of the architecture applicable Characteristics for pairs and sets of Requirement Statements: Absence of redundancy-each requirement specified only once Consistency-terms used consistent Completeness-usable to form a set of "design-to"requirements Absence of conflicts-not in conflict with other requirements or itself CLGO System Engineering by J.J.Gao 18
+ - A complete sentence with a single“shall”per numbered statement Characteristics for Each Requirement Statement: Clear and consistent–readily understandable Correct–does not contain error of fact Feasible–can be satisfied within natural physical constraints, state of the art technologies, and other project constraints Flexibility–Not stated as to how it is to be satisfied Without ambiguity–only one interpretation Singular–One actor-verb-object requirement Verify–can be proved at the level of the architecture applicable Characteristics for pairs and sets of Requirement Statements: Absence of redundancy–each requirement specified only once Consistency–terms used consistent Completeness–usable to form a set of “design-to”requirements Absence of conflicts–not in conflict with other requirements or itself System Engineering by J. J. Gao 18 Attributes of Acceptable Requirements
Today's Agenda Requirement Analysis Process Requirement Analysis in Detail Logical Decomposition Quality Function Development(QFD) Functional Interface CLGO System Engineering by J.J.Gao 19
+ - 19 Today’s Agenda Requirement Analysis Process Requirement Analysis in Detail Logical Decomposition Quality Function Development(QFD) Functional Interface System Engineering by J. J. Gao