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  • Posts

    • Is Time Infinite?
      Scientific Test and Analysis Techniques (STAT) STAT implements the use of scientific and statistical methods in developing rigorous, defensible test plans and the evaluation of their results. STAT assists the test community in improving the planning, execution, analysis, and reporting of integrated testing. One example of STAT is design of experiments (DOE). DOE DOE, an application under STAT, is a structured process that provides the scientific and statistical methods needed to rigorously plan and execute testing. By following this process, testers gain the following benefits: An understanding of the likelihood of successfully identifying, as well as the likelihood of mistakenly identifying, significant performance drivers. A sound method for determining and justifying the number of tests planned and assets needed to obtain required information. The ability to make informed trade-offs of test costs (assets) versus information gained. A rigorous method of determining specific scenarios that provide the most useful data for characterizing system performance including deficiencies and for identifying drivers of system performance. The ability to identify interactions between test factors. This is seldom possible with other methods of developing test matrices. DOE is sequential in nature, where each series of tests informs the next series of tests. Evaluations should take into account all available and relevant data and information from contractor test, DT, and OT. DT results will be used to support OT findings and scope OT events. When utilized early in system development, DOE provides the most efficient method of identifying system deficiencies so that appropriate and timely corrective actions can be taken when costs of correcting deficiencies are minimized. The DOE process involves the following steps: Determine the purpose of the test to include output variables (results) that will be measured. Determine the input variables (factors) that are expected to have an impact on results. Determine the levels for each factor (e.g., for a factor “range to target,” levels may be 2 km and 10 km). Determine constraints that must be considered when creating the test matrix. For example, a missile fired from an unmanned aerial vehicle (UAV) may have a maximum range to target of 10 km from a UAV at high altitude but only a 5-km range from low altitude. A constraint to prevent tests that would fire a missile from low altitude at a target 10 km away must be in place when creating the test matrix. Create the test matrix and review it with interested parties/SMEs. Execute tests. Analyze test data. Make decisions based on analysis. In reality, above steps are an iterative process for several reasons that include the following: Constraints are not always easy to identify and SMEs may notice impossible/impractical test scenarios in a matrix that were not identified in advance. The number of test assets determined to be necessary may not be affordable. At this point, trade-offs of cost vs. information must be made. Use of DOE in testing is appropriate for anything other than a simple demonstration of capability. It is useful in planning and executing component tests, simulation, hardware-in-the-loop (HWIL), and full-system testing. Ideally, because DOE is most powerful when applied sequentially, DOE will be utilized throughout development and testing in all areas. For example, early in a program, digital simulation is often the most mature tool available for evaluating system performance and making design decisions. DOE is used to create simulation test matrices to identify factors that should be tested in HWIL. A DOE for HWIL is then created that addresses these factors. Then data from HWIL is used to modify or validate the digital simulation. Because DOE was used, factors for which results in digital simulation and HWIL are different can be identified more accurately than if the tests were planned using another method. Source: https://acc.dau.mil/CommunityBrowser.aspx?id=518190  
    • Is Time Infinite?
      Really??  So we can add Reading Comprehension to 'The List'... Hazard said... "(14 light years away. That's how far light travels at 186,000 miles per second over 14 years.)" See the "over 14 years" part??  Is that a distance or a "Time Period"?    regards
    • Is it just me...
      I dont live in the states nor the delusional states 
    • Derailing thread
      they are boxers ...there is no chance of that lol
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