When the construction works, the assumption is that the subcontractor has all the heavy machinery necessary to carry out their part of the deal, while the introduction of ISO standards organized according to this assumption is that the organization possesses the supporting documentation of its processes.
Note that the assumptions is not always filled at the time of writing the project's reach; it is only stated that it may be done so later during the project. Assumptions are tracked in the project plan and the risk management plan.
Project assumptions are all of the elements of the project that need to be defined so that project delivers requirements in allotted time. For example, when setting software solutions, the assumption may be that a user has specific hardware that successfully supports a software solution.