After using the report writer for several months, the marketing analysts gained confidence in using it, but the marketing department manager became concerned. Whenever analysts revised reports they had written earlier, the coding errors kept reappearing in their command sequences. The manager was sure that all the analysts knew what the errors were and how to avoid them. The most likely cause of the reappearance of the same coding errors is inadequate:. 1. Change control
2. Access point
3. Backups
4. Testing