A project is a temporary endeavor undertaken to create a unique product, service, or result (PMBOK 4).
Well above is the definition of project based on PMBOK 4. Let us explore that statement in detail. temporary endeavor means a kind of work that is done within a duration, there is beginning and end. So, when is the beginning started and the end will end. The beginning will be started after project charter and project plan have been created and accepted by stakeholders. The end of the project is when the project objectives have been achieved, it means that project objectives(deliverable) have been accepted by sponsor and owner, also requirements of project have been fulfilled. But sometimes, project will be terminated if there are several condition i.e project objectives will not or cannot be met. Those things can also happen to every single project because a lot of causes.
from “unique” word we can get information that every single project must have different result or service than another one. So then, how to compare it ? Actually, the comparison between a product/ service with another one is not only in the product/ service it self but also there are several considerations to consider that one project is different with another. Those considerations are : location(different design), condition (circumstances), contractors(project management vendor) and etc. All those thing will be able to be one of some reasons that a project is unique.