The document discusses common sins or reasons that ERP implementations fail to meet expectations, along with best practices to avoid them. It identifies four main sins: 1) Overlooking the purpose of the ERP system and not focusing on process improvements. 2) Lack of commitment from top management. 3) Poor ERP system selection that does not match the organization's needs. 4) Poor project management that shortcuts critical events. The best practices include focusing on process analysis and optimization, securing top management buy-in, thoroughly selecting the right ERP system and partner, and employing sound project management strategies with a cross-functional team.