Summary Screen

QW5 Help Files

The Summary screen symbolically displays those variables for which QW has detected a Rule violation.  If there are no Rule Violations detected a message will be displayed. 

The Summary screen displays the numerical value entered or calculated for a variable through the use of colors, diamonds and arrows.  The colors indicate the zone the value equates to:

on target and in control

in control but closer to a control limit than target

out of control but within specification limit

out of specification limit

The symbols indicate the position of a point relative to the target line.  A diamond means on target.  An up arrow means above target and down meaning below target.  The combination of both color and symbol gives you a clear view of where a particular point is positioned in the zones defined in QWSETUP for a variable. 

Rule Violations

To determine which Rule Violations are to be checked, QW reads the file QWRULES.SYS.  This file contains all the Rules that have been defined in QWSETUP for all applications.  The order in which the rules were defined in QWSETUP dictates the order in which the rules will be checked. Each variable can have a particular rule enabled or disabled.

QW scans up to the current number of Records in memory, see RECORD X of Y in the Status bar, for each numeric or calculated variable to determine if a Rule has been violated.  For example, to determine if a seven point Rule has been violated QW will scan backwards to find the last 7 non-blank points for a variable even if it means looking at 50 records to find the last seven points.  QW will only scan up to the maximum number of records currently in memory.

Each variable for which a Rule Violation has been detected is displayed on The Summary screen as one line. 

The top right corner of the screen contains a text description of the Rule Violation for the currently highlighted variable.  The text description for each Rule Violation is defined in QWSETUP under the RULES option.

Using this Screen

The Summary screen is designed as the main tool to use to monitor your process based on the control/trend rules that you established in QWSETUP.   The Summary screen advises you of only those variables that have violated a control rule and may require corrective action. 

Once the Summary screen has advised you of a control rule violation you must investigate the violation and establish its root cause.  Once the cause has been established you must decide on the corrective action. The corrective action could be a process adjustment, repair work or scheduling part replacement for a later time.  You should record the action taken as it can be quite helpful when investigating future rule violations. 

The use of the Summary screen minimizes the effort needed to monitor a process.  The approach of reacting only to control rule violations and investigating the cause of the violation will protect the process from unnecessary adjustments which tend to increase process variation.

The priority of which Rule Violation should be acted upon first should be determined for each application and installation.  A reasonable strategy would be to act on out of specification conditions followed by out of control conditions.  Trending Rules can also follow this procedure.  You may also want to rank variables in terms of critical and non-critical to help this decision making process.