Eight reliability models are used by IntervalMAX to model the in-tolerance probability of equipment over time. Each model is characterized by a set of parameters.  Because of their mathematical form, the reliability models can easily become unmanageable if the values of their parameters are allowed to be set without limit. The Initialize Parameter Constraints Screen is used to set constraints that are subsequently maintained in the IntervalMAX database.  This screen is accessed from the Analysis Parameters Screen by clicking the Set Parameter Constraints button on the Intervals tab.

 
The reliability model to be used to fit resubmission time data is selected from a drop-down list. The model constraints consist of an Initial Estimate, a Lower Limit and an Upper Limit for each parameter.  IntervalMAX contains default constraints that have been found appropriate for a variety of reliability modeling problems.  Changes are made by entering new values into the Constraints table pressing the Save to Database button. Constraints are restored to their default values by pressing the Restore Defaults button. Changes are canceled by pressing the Cancel button.