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lecture_9 - Prototyping and Testing S. Laguette ME 128 Fall...

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Unformatted text preview: Prototyping and Testing S. Laguette ME 128 Fall 2007 October 31, 2007 10/31/07 ME128 1 Prototyping and Testing Prototyping Prototyping: Types Prototyping: Process Testing Test: Types Case Study 10/31/07 ME128 2 Prototyping Hardware Easily modified and extensible model of a system, including location of individual hardware components. Software Easily modified and extensible model (representation, simulation or demonstration) of a planned software system, likely including its interface and input/ output functionality. 10/31/07 ME128 3 Prototyping: Hardware Present to customers for reaction to design Size correct for application? Components placed for ease of use? Wood, foam, cardboard 10/31/07 ME128 4 Prototyping: Software Sometimes used to precede hardware models Functioning example of final product Determines if it satisfies the customer's needs early in process Allow testing of changes in processes prior to actual implementation of changes 10/31/07 ME128 5 Prototypes: Types Low-Fidelity High-Fidelity Exploratory Experimental Operational Horizontal Vertical Diagonal Global Local 10/31/07 throw-away prototype that Aset of screens entire set of that models A Aprototypeofthatmodels the single Aprototypedrawings (e.g., A prototype that isto A prototype used Astoryboard)of project Anprototypeprototype that a iterativedynamic, used to a expanded provide clarify awith that system; features but with few features but system many an down toprovide validate systemrefined usability-critical horizontal is static,to identify a progressively goals, non-computerized, computerized, working horizontal prototype that much detail; aavertical littleit detail; a vertical specificationshorizontal component; particular the planned of level, until becomesto examine requirements, mock-up modela greater then ofsystem's non-working the final modelsofaa system's slice of slice prototype designs, or vertical below that the systeminterfaceis pointto alternativethat forand system chart from top user number of on onefrom the structure features structure chart feature focused investigate a large and covers multiple levels of toplanned system bottom; to a useful top down mostspecific complex system the the later stages of the in system's structure depth most useful in chart stages of design design early ME128 6 Prototype: Process Build low-fidelity prototype Re-specify, re-design, re-evaluate Freeze these specifications Finish building the product 10/31/07 ME128 7 Testing Subjecting a device to conditions that indicate its weaknesses, behavior characteristics, and modes of failure. Ultimate goal: satisfied customer 10/31/07 ME128 8 Testing: 3 Basic Reasons Basic Information Verification Includes vendor evaluation, vendor comparison, and component limitability Process of evaluating the products of a given phase to correctness and consistency with respect to the products and standards provided as input to that phase Process of evaluating a product to ensure compliance with specified and implied requirements ME128 9 Validation 10/31/07 Testing: Defined Establishing confidence that a device does what it is supposed to do The process of operating a device with the intent of finding errors Detecting specification errors and deviations from the specification Verifying that a system satisfies its specified requirements or identifying differences between expected and actual results The process of operating a device or component under specified conditions, observing or recording the results, and making an evaluation of some aspect of the system or component 10/31/07 ME128 10 Test: Types Verification Validation Black Box White Box Hardware Testing Software Testing Functional Testing Robustness Testing Stress Testing Safety Testing Regression Testing 10/31/07 ME128 11 Stress Testing Designed to ascertain how the product reacts to a condition in which the amount or rate of data exceeds the amount or rate expected. Help determine margin of safety that exists Include Duration and Worst Case Scenario 10/31/07 ME128 12 Black Box Verifies that the end-user requirements are met from the end-user's point of view Performed without any knowledge of internal structure Tester is only interested in finding circumstances in which the device or program does not behave according to its specification. 10/31/07 ME128 13 References Text, Reference King, P.H. and R.C. Fries, Design of Biomedical Devices and Systems, Marcel Dekker, 2003 King, P.H. lectures series 10/31/07 ME128 14 ...
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