(3) Maintenance downtime: This is the time when the system is unavailable in providing its intended function. It
is a composite factor of maintenance time, logistic delay time, and administrative delay time. The value of
this criterion is given as a fuzzy value.
(4) Reliability: This can be defined as an ability of the system, which will perform in a satisfactory manner for a
given period of time when used under specified operating conditions in a given environment. This is given a
linguistic value for the study.
(5) Capability: This shows the capability of the various policies to handle the heavy and continuously changing
production loads, i.e. number of parts produced. It is also given a linguistic value.
(6) Repair load: This is an indicator of the ratio of repair resources over the production resources. In other
words, it shows the traffic density for the repair process. For example, FBM requires fewer repair resources,
but TQMain requires a good number of repair resources.
(7) Operator skills: It shows which maintenance policy has skilled operators. It is given as a linguistic value.
(8) Flexibility: This is the ability of the system to adopt the changes within no time. It is shown in linguistic
symbols.
(9) Efficiency: This shows how the system works efficiently, i.e. providing quality products with less repair.
(10) Facility utilisation: This criterion shows that all the repair facilities are utilised in an appropriate manner.
It is also shown in linguistic symbols.
(11) Resource availability: This defines the availability of repair resources at the time of maintenance. It is also
provided in linguistic values.