Questionnaire Design

A questionnaire is a series of questions asked for the purpose of gathering information from respondents. It is given to people in order to collect facts or opinions about something to be researched. It is usually in printed format and is submitted for replies that...

Group Replacement Theory

Replacement of items that fail suddenly  There are certain items which do not deteriorate but fail completely after certain amount of use. These kinds of failures are analysed by the method called as group replacement theory. Here, large numbers of items are failing...