In a few words
The standard is a document, whether on paper or in a computer file, which describes precisely how to do things. It indicates not only what to do, but also how to do it.
When writing the standard, it’s important to focus on adding value by using the best-known way to perform a task.
These standards will reduce the amount of time wasted on nonessential or non-value-added tasks, and instead focus on tasks that add value. This is the surest way to combat variability.
The standard is only fixed until the next improvement. On the contrary, it must be updated regularly as time goes by and problems are resolved. Thus, it is part of your continuous improvement process.