to be completely isolated so it doesn't bother one and the other and also because it's so easy to make changes it allows you it encourage you to experiment if you want to try a new JDK or SDK or a new version of the database just make the changes started and if you don't like it you just completely what the whole environment and the last section that we are going to talk about feedback doesn't matter what you were what you are working on you should always try to find the shortest and tightest feedback loop possible feedback is what it tell