Main Screen Features 
Every aspect of the measurement uncertainty analysis process can be accessed from the Main Screen. Various options, functions and features include menu and tool bars for quick access to drill-down analysis screens and worksheets, an analysis procedure checklist, a section containing key information about the subject parameter being analyzed, a table containing a list of measurement process error sources and related fields for entering and display associated uncertainty information, the total combined uncertainty displayed in the bottom of the error source table, and a section for estimating uncertainty growth over time from measurement.

The Menu bar provides access to a wide variety of program functions and options including saving and opening analysis files, printing options, editing options, opening and updating the measurement units and instrument databases, opening process uncertainty worksheets and screens, viewing distribution plots for selected error sources, viewing a pareto chart of error source contributions to overall uncertainty,  and running external applications.   
 
The Tool bar provides icons that can be used to access selected options and functions.  A brief description of the associated function or options can be obtained by placing the mouse cursor over the icon of interest.
 
The user-interactive Analysis Procedure checklist, located on the left side of the Main Screen, provides a structured walk-through of the basic steps in analyzing uncertainty for typical measurement situations.  Selecting any one of the listed items launches the appropriate worksheet, screen or template.  When an analysis procedure step is completed, the corresponding check box color changes from red to blue and a check mark appears. 

The Subject Parameter Information section summarizes what is known about the subject parameter being analyzed.  Data are not entered directly into this section.  Instead, the information displayed is based on data entered into the Subject Parameter Bias Uncertainty Worksheet or Subject Parameter Template. 
 
The Error Source table provides the primary means for identifying and estimating measurement process uncertainties and including them in the total, combined uncertainty.  The table contains seven columns for selecting error sources, entering data, displaying computed results, and selecting which error sources to include in the combined uncertainty estimate.  Measurement process errors include: Subject Parameter Bias, Measuring Parameter Bias, Subject Parameter Random, Measuring Parameter Random, Subject Parameter Resolution, Measuring Parameter Resolution, Operator Bias, Digital Sampling, Computation, Environmental Factors, Stress Response, and User Defined.  Clicking on the desired Error Source button activates the appropriate screen or worksheet for entering data and estimating uncertainty. 
 
The Subject Parameter Uncertainty Growth section of the Main Screen allows the user to estimate the uncertainty in the value of the subject parameter at some specified elapsed time since measurement.  The uncertainty growth forecast is based on information obtained using the built-in Reliability Modeling feature.