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Planning SharePoint Solution Packages (WSPs)
SharePoint architects and developers often wonder how best to design solution packages for long-term ease of use, especially through upgrade cycles. In a survey of SharePoint developers I found a range of strategies from one monolithic WSP to hold everything, up to practically one per feature which resulted in as many as 50 WSPs for a project. The variance depended on the developer's goals for maintenance. Application vendors want to keep things simple for admins, so a single solution per product makes sense. When downtime needs to be absolutely minimized and you need absolute granular control over each and every feature, maybe you want to maintain dozens of packages so that upgrading one will minimally affect the others.