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;Inability to understand offering by ERP vendor
"It is estimated that approximately 90% of enterprise system implementations are late or over budget".<ref>Martin, M., 'An ERP Strategy', ''[[Fortune magazine|Fortune]]'', 2 February 1998, pages 95–97.</ref> A plausible explanation for implementations being late and over budget is that the company did not understand the offering by the vendor before the contract was signed.{{Citation needed|date=September 2010}} A typical example of this would be the scenario where a vendor may offer 5 days of services for the purpose of [[data migration]]. The reality is that there is a huge amount of work required to input data onto a new system. The vendor will import the data into the new system but expects the company to put the data into a file that is easy to import into the system. The company are also expected to extract the data from the old system; clean the data and add new data that is required by the new system. "ERP, to be successful, requires levels of data integrity far higher than most companies have ever achieved – or even considered. Inventory records, [[bill of materials]] (BOM), formulas, recipes, routings, and other data need to become highly accurate, complete and properly structured".<ref name="MakingItHappen">Thomas F. Wallace and Michael H. Kremzar, ''ERP: Making it Happen''. {{ISBN|0-471-39201-4}}.</ref> This typical scenario is one of many issues that cause implementations to be delayed and invariably lead to requests for more resources.
;In-house Expertise
For selecting an ERP system to implement, an organization can choose to hire a knowledgeable source for in-house management or use a consulting firm. With a third party vendor, it can be easy to not fully comprehend the system capabilities and the gap of requirements the ERP system does not offer. For that reason, organizations need to weight the costs of hiring an ERP knowledge expert or trusting a third party vendor for implementation. If an organization decides to use a vendor, they will need to decide how to handle the ongoing maintenance of the system.
== A proper system selection methodology ==
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