Engineering topics
Publications and source records attributed to Hihn, J..
This paper describes the approach and algorithms used to generalize the paired ratio comparison matrix technique to use information inherent in multiple estimates, multiple reference projects, and estimator range information to generate estimated effort and size distributions.
The presentation will provide a brief overview of the SQI measurement program as well as describe each of these models and how they are currently being used in supporting JPL project, task and software managers to estimate and plan future software systems and subsystems.
In this talk we will discuss how uncertainty has been incorporated into the JPL software model, probabilistic-based estimates, and how risk is addressed, how cost risk is currently being explored via a variety of approaches, from traditional risk lists, to detailed WBS-based risk estimates to the Defect Detection and Prevention (DDP) tool.
This paper describes a measurement methodology developed for assessing the readiness, and identifying opportunities for improving the effectiveness, of distributed collaborative design teams preparing to conduct a coccurent design session.
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NASA's JPL managed by Cal Tech is currently investing ways to improve its ability to increase the cost estimation accuracy early in the project life cycle.
It is the purpose of this paper to analyze the structure of the cost estimating relationships that commercial cost models use and to test whether they are viable cost functions.
This paper summarizes how JPL's parametric mission cost model (PMCM) has been validated using both formal statistical methods and a variety of peer and management reviews in order to establish organizational acceptance of the cost model estimates.
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The Jet Propulsion Laboratory (JPL) in Pasadena, California is a US Government Federally-Funded Research and Development Center that is run by the California Institute of Technology for the National Aeronautics and Space Administration (NASA) JPL's primary role is to conduct unmanned, robotic missions from Explorer to Voyager, to Mars Pathfinder.
This paper presents an overview of a parametric cost model that has been built at JPL to estimate costs of future, deep space, robotic science missions.
A new approach to change management has been developed and applied at the Jet Propulsion Laboratory (JPL). It's main focus is on aligning the organization with the strategic plan; and understanding the internal organizational relationships that impact change, which ultimately determine an organizations ability to be transformed and renewed.
The majority of software engineers resist the use of the currently available cost models. One problem is that the mathematical and statistical models that are currently available do not correspond with the mental models of the software engineers. In an earlier JPL funded study (Hihn and Habib-agahi, 1991) it was found that software engineers prefer to use analogical or analogy-like techniques to derive size and cost estimates, whereas curren CER's hide any analogy in the regression equations. In addition, the currently available models depend upon information which is not available during early planning when the most important forecasts must be made.