Data re-entry errors are possible at any of the above stages, so each stage requires a high level of skill experience. Adjustments and corrections made downstream in the process must be manually fed upstream for data consistency. Traditional wire harness manufacturing methods are vulnerable to errors in the fragmentation process and can lose tribal culture as engineers retire or leave. Other key issues include: inconsistent or inaccurate costing, sub-optimal wire harness tooling design or manufacturing process design, and misplacement of critical information on the shop floor. These can directly lead to inefficiencies in the production process. As a result, manufacturing and overall costs may exceed quotes to customers, and production quality may suffer adversely.