Lessons learned during CMS tracker end cap construction

With more than 15 000 silicon strip modules and a silicon area of about 200 m 2 , the CMS silicon strip tracker will be the largest silicon strip tracker ever built. More than half of the volume is occupied by the two end caps, which comprise about 42% of the silicon strip modules. Construction of the end caps is far advanced. In this article the experience from module production, integration of medium-sized substructures, the so-called petals, and from the integration of the end caps themselves is summarized.