Page 130 - Solid Waste Analysis and Minimization a Systems Approach

108 THE SIX SIGMA SYSTEMS APPROACH FOR DEPLOYMENT

6.6 Control

The control phase is designed to maintain the benefits of the improved process. Tools
that are commonly used throughout this process are

■ Control charts
■ Documentation
■ Change management
■ Communication
■ Reward and recognition
■ Check sheets

Control charts (Fig. 6.7) are used to identify variation whether it is random or
assignable (Gupta et al., 2007). Control charts record a task over a given amount of
time and are plotted against the specification limits to observe if the process is in con-
trol. Documentation is the recording of the new process steps to provide standards and
guidelines to the employees (Gupta et al., 2007). An example of documentation is ISO
9000. Communication is essential throughout the process but to implement something

Figure 6.7 Control chart.