This document provides 10 reasons why a SharePoint migration may fail:
1) Lack of knowledge about SharePoint and its underlying technologies.
2) Ignoring training which helps with adoption and success.
3) Poor communication about the changes to users.
4) Relying only on database attach upgrades without considering custom solutions.
5) Not building a new architecture to take advantage of SharePoint 2013 features.
6) Not inventorying and testing all sites for upgrade issues.
7) Lack of governance, information architecture, and migration planning.
8) Not defining clear and measurable goals for a successful migration.
9) Underestimating the importance of branding for user experience
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