Which of the following is NOT a true statement regarding the big-bang ERP implementation approach? Group of answer choices With big bang, there is no legacy system to go back to. One of the reasons that ERP engagements fail is that they take too long to complete. Because the big-bang approach handles design, development, testing, and implementation of all modules simultaneously, it generally has a shorter duration from start to finish. Big-bang implementations basically leave existing legacy system intact until they are replaced. Because it replaces a number of legacy systems all at once, big bang does not require temporary interfaces. Some firms chose a big-bang approach because of limited resources. Where a phased-approach requires substantial one-time resource use, a big-bang approach can spread those peak resource requirements over multiple phases