The completion of a construction usually depends on the collaboration (such as providing blueprints, assigning construction sites) of its proprietors. If one of the proprietors is unable to perform his/her duties or failed to perform them timely, the undertakers have to suffer from delays or even failure. For a long time, the academia and the practitioners have been debating over the nature and the legal responsibilities of proprietors’ collaboration. Since it is an issue that deeply concerns the rights and obligations of the persons involved in the construction, discussions are greatly beneficial for the reference of future practice. In this article, the nature and contents of the collaboration added with its legal effects will be discussed, and the systems adopted by Taiwan, Japan and Germany will be analyzed to explore the true meanings of these actions.