To enter Mct data

1.	Select the required item in the Product tree view.

2.	From the Tree menu, choose Edit; the Item Data dialog box opens:

MNT_MainSwitch

The three fields grouped together in the upper left section of the dialog box contain information required to calculate maintainability parameters for the current item.

Define the following:

Method of Mct calculation	If you select default from the list box, then RAM Commander uses the maintainability method defined in the Project Configuration dialog box. If you select user defined, then you can select a maintainability method in the Method list box.
Method	Make a selection from this list box if you selected user defined in the Method of Mct calculation list box.
Level of Replace	Make a selection from this list box if you want to consider the item during maintainability prediction. See more on level selection in Philosophy and Assumptions paragraph.

In addition to these three fields, you must also make a selection for the source of Mct. In the list box, just under the maintainability parameter fields, you can select one of the following three values:

Predicted	The computation is made according to the selected maintainability prediction method. RAM Commander displays the result in the Mct(c) field.
User defined	You explicitly enter a value in the Mct(m) field.
Allocated	Select this value when you want to use the result of the maintainability allocation. See also Maintainability Allocation paragraph.

The lower part of the dialog box includes information required for the MTTR calculation of the current item as an assembly. Here you define the following parameters:

Level of Repair	Select Discard, Unapplicable, Organizational, Intermediate, Depot, Supplier or Manufacturer. See more on level selection in Philosophy and Assumptions paragraph.
Confidence level	Select a percentile used for calculating Mct max.

Define also the Fault Isolation and Ambiguity data - see the next paragraph.