27. The method of claim 26 , wherein the first test case is generated such that the first sequence of communications between the first and second systems are a first set of operations and the second sequence of communications between the third and fourth systems are a second set of operations based upon the first sequence diagram being in the first position and the second sequence diagram being in the second position in the scenario.
27. The method of claim 26 , wherein the first test case is generated such that the first sequence of communications between the first and second systems are a first set of operations and the second sequence of communications between the third and fourth systems are a second set of operations based upon the first sequence diagram being in the first position and the second sequence diagram being in the second position in the scenario. 28. The method of claim 27 , further comprising: positioning a third sequence diagram including a third sequence of communications between at least a fifth system and a sixth system to third position in the scenario; and generating a second test case wherein the third sequence of communications between the fourth and fifth systems are a third set of operations based upon the third sequence diagram being in the third position in the scenario.