Consider a project of designing a rocket (like Moonraker from Ian Fleming’s famous novel). A rocket would require a team of engineers who would be associated with designing the rocket and ensuring its operation. However, a Shamrock team would be required during the design stage when a group of aeronautics experts, combustion experts, mechanical engineers, chemical engineers, electrical engineers, etc. would all come together to create a rocket which will work perfectly on the date of its launch. A Shamrock team composed of a different set of experts would be required at other stages too.
The team can include both internal and external set of experts based on the requirements of the project.