Everyday we often have to make decisions very quickly, without go through step-by-step decision making process. In these situations just remember goals and let your intuitions guide you.
Wireframes are visual representation that show the placement of elements in a user interface and demonstrate the intended layout and functionality of a solution.
Wireframes are graphical guide which helps Stakeholders/Clients to get a better understanding of what is going to be developed and Project Manager ensures that....
The scope of the project is what ultimately drives the execution of the project;
Scope can be considered as deliverables or boundaries of the project, it can also be define the need to set stakeholder expectations, to deliver the expectations, to mange the changes, and to minimize surprises and gain acceptance of the project.