4. Underestimating the Time and Resources Required: Generally, most companies do not have the clue of time and resources required for the switch. Implementing a new ERP system would require more time and resources. It is always best to take advice from a certified consultant to measure the time required for the switch so that gradually you can make the changeover without upsetting the company's regular business process. James Mallory, marketing director, e2b technologies says "The time involved can be estimated by dividing the cost of the software by 100," he explains. "For example, $20,000 for software will take approximately 200 man-hours or five weeks to implement using a certified consultant. Double that number if you plan to self-implement with minimal professional assistance."