Simplistically speaking, randomization in Six Sigma and any experimentation can be likened to surprise visits which help expose undetected lurking flaws in any place you may want to think of. Sometimes it pays to run random checks, even on highly standardized procedures, which eventually detect factors running over the length of the experiment in an uncontrolled manner.
As a general rule, industrial experiments are run in split plot modes for expediting purposes and for reasons of governing and monitoring. The experiments let the effects of the split plot factors for estimation more precisely as opposed to the effects of the whole plot. This turns out to be unfortunate when the focus lies in whole plot factors.
Randomization in Experimental Design
The importance of conducting randomized research experimentation arises from the need for convenience in controlling the extraneous variables. The strikingly out of the ordinary variables which otherwise would not have given ways to measure would now spread out evenly or average out across the experimentation conditions, when randomized.
Statisticians favor a completely randomized testing environment for sound theories. But the engineers who are running the experiments often neglect restrictions like the split plot experimentation and get caught unaware of the associated risks. On their part, statisticians too, fail to understand that the restrictions on randomization do not result in reduced information than a whole plot randomized design.
Further Justification of Need for Randomization
What makes things worse is combining multiple factors and their levels can make things very large a task to handle. In order that the things are simplified, some informed deductions become imperative to understand which factors will generate the most pertinent data that helps provide information for substantial results. The experiment must be randomized at the sequential run level.
It must be understood that restriction on randomization and replication of experiments leads to complex designs having a number of fatal experimental errors. Because it crucially allows external factors equal chances to affect each run. The expected results are difficult to have with non-randomized experiment, the reason being the risk of external factors acting in a predetermined manner, and adding noise to the response.
It is desirable for engineers to run experiments in multiple sets (called replication). This can be depended upon to provide greater confidence in evaluating the results, as you are flush with abundant data. Depending on budgetary flexibilities, it is desirable to have more of these replicated experimentations for apparent reasons.
Handling Randomization By Black Belts
Six Sigma Black Belts must know the difference between different types of models of experimentation. For the experimentation to be effective and result-producing, the Black Belts are the crucial links and must understand the concepts of randomization.
In cases where background variables can't be eliminated totally, another concept called blocking can be used. It spreads the variables across the experiment.
Randomization has its root in science just how Six Sigma draws its strengths. The interpretation of results in split plot mode must be done carefully to avoid inherent pitfalls.
Managing Implementation Teams Through Effective Training
Normally, the most experienced employees are selected for carrying out the implementations. However, mere experience does not guarantee the success of the implementations because Six Sigma requires extensive knowledge about the various tools and techniques that are utilized during the implementations.
By providing the requisite training, organizations can easily transform their employees into Six Sigma professionals such as Green Belts, Black Belts, Six Sigma Champions and others who will then be able to carry out the implementations far more effectively. Another problem is that employees are generally resistant to change, even if the changes aim at reducing their workload and improving their work environment.
Some employees are of the opinion that Six Sigma ultimately results in job-cuts. Such employees are unlikely to lend their full support and cooperation until and unless the organization makes it a point to alleviate their fears and misconceptions. The best way of achieving this is to include an awareness program as part of the training, providing a glimpse of all the potential changes that are most likely be initiated by the implementations. Employees should also be informed about the HR policies that have been devised to deal with unavoidable job cuts, if any. Once employees get to know all these, they are most likely to react positively to the implementations.
Continuous Support And Guidance
Six Sigma implementations are carried out at the most basic level, but this does not free senior management from its duties and obligations. Top management cannot afford to overlook the implementations in the guise that it has other important issues to deal with. Support and guidance from the senior management becomes all the more necessary when the implementations are to be effected in complex business processes characterized by multiple sub-processes.
The implementations require support in the form of men and material, which need to be sanctioned in a timely manner without affecting the day-to-day functioning of the organization. This will only be possible if the senior management plays the role of an active member dealing with the implementations. Continuous support and guidance from senior management will make it possible for implementation teams to carry out the implementations within the specified time and monetary budgets.
Proper team management is necessary for successfully executing any type of project in an organization and Six Sigma is certainly not an exception, although it is quite different from other type of projects. Just by utilizing the basic team management concepts and techniques, organizations can easily ensure the success of their Six Sigma initiatives.
Tony Jacowski has sinced written about articles on various topics from University, Six Sigma and Information Technology. Tony Jacowski is a quality analyst for The MBA Journal. Aveta Solution's Six Sigma Online offers online and certification classes for lean six sigm. Tony Jacowski's top article generates over 90500 views. to your Favourites.