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  1. Then you are already more advanced than the average programmer. What you will see? Or how long it will take to make it right? Sub VI, sub VI, sub VI. Look for reuse. Take a very small section and make it a sub VI (only one click). Clean it up. Nibbling old code from spaghetti to sub VI's has huge benefits. Don't do it all at once. A little clean up goes a long way. Do a sub VI every week or month. I can guarantee you've rewritten the same behaviors and data manipulations many times in the past; probably even within the same application. As you create the sub VI's you will start to notice some of them are very similar. Look to see if you can make them identical. This is a heuristic way of creating code reuse. Then you can start looking for old code that you have turned into a sub VI that look similar to your current project. Your old code is a test harness for your code snippets. It's been proven to work, right? Once you have it working correctly in both old and new; fill out the documentation, icon etc if you haven't already and put comments in it. Then stick it in your special toolbox for reuse. You don't need to publish the modified old code but as you gain confidence in your toolkit, you will merge the reuse code into it. If you change the reuse code, run the old software to make sure it still works correctly. This is called Black Box Testing. Old code is very useful. It's proven code that works. Cleaning it up and sub VI'ing it will benefit your current and future projects too. You will eventually be able to spot reuse code candidates as you create new VI's - the patterns will jump out at you. You will look like you were a master from day one when other people look at your old code. Only you and your source control system will know the truth .
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