1) CRM is a customer-facing solution, whereas ERP is a backend solution.
2) CRM is business driven and IT supported, whereas ERP implementations are typically driven by IT and supported by business.
3) The traditional implementation methodology, like ASAP, may not be suitable in an SAP CRM implementation. You may have to consider other implementation methodologies, like cycle methodology or conference-room methodology based on the business requirements.
4) Business process change management is one of the most critical success factors in an SAP CRM implementation.
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