- The lifecycle of most spacecraft consists of a final phase where all the systems are tested to various levels of synergy. One of the most important and complex set of tests are the Closed Loop Tests (CLTs), where the spacecraft is sent simulated orbital data, and then its attitude response is observed.
And the earth brought forth grass, and herb yielding seed after his kind, and the tree yielding fruit, whose seed was in itself, after his kind: and God saw that it was good.
Genesis 1:12 KJV