Six Sigma Tools are very useful in many different instances including both with the process as it stands, as well as on their own outside of the process. Depending on the scale of your process improvement projects, you can figure out which elements of Six Sigma are most important to you and see whether you need to utilize the entire Six Sigma Process or if you just need certain aspects and tools to help. You can also get to know more about six sigma tools by phase from online sources.
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If you just need to run an analysis based on data to see where your company stands and don't need to actually create a process improvement, then you will be able to get away with just using that particular element of Six Sigma. Likewise, if you know of something that needs to be fixed, and you just need to measure a few things and then determine the best solution based on those measurements, you can just utilize the specific tools that will accomplish those goals for you.
When it comes to working with Six Sigma Tools there are quite a few things to consider. However, as long as you have the proper Six Sigma Training and are able to make the most of each situation by analyzing it in defining the problem first, you will be much more successful in your efforts.
Sometimes you might even realize that the Six Sigma Process or specific Six Sigma Tools might not be exactly what you need all. This is absolutely fine. Once you have defined your problem and the actual result that you seek in resolving this problem, you can determine which Six Sigma Tools, if any, are right for your cause.