Scale is used for many different things in Architecture.  In drawing, whatever is closest to you is bigger and as it moves back, it gets smaller.  So if you had a crowd of people, then the people in front would be larger in scale than those in the back of the crowd.  Also, scale is a way of showing power or hierarchy.  This is shown in the pyramids, ancient Greece, and many other places all over the world.  Normally, the larger buildings have a religious or political use or power.  We also use certain scales to show a room, building, or piece of furniture in a smaller way, so as it will fit on paper or board.  One example of this was drawing a plan view of Pat's chair in 3": 1' 0" scale. 

radified.com/photos/step_pyramid.htm

www.aztec-history.net/aztec_pyramids

Unity can be the relationship between two drawings, to spaces, or to different cultures.  One example of this was discussed a week or so ago in History.  Similar architectural styles can be found between places half a world away from one another.  The Aztec pyramids in Mexico and the pyramids in Mesopotamia have the same stacked formation, however, they were on opposite sides of the world.  Unity was also a major issue discussed in the workings of the Pathways, Edges, and Boundaries project.  The issue was creating designs specific for each area, but still maintaining a sense of unity between all of the groups.

                     

Vignettes are a way of showing a scene, but not showing everything within the space.  In a vignette, there are no definite ending lines.  The ending lines trail off, giving you a less defined space, where watercolor or whatever coloring medium does not have to follow any definite ending points either.  

In drafting, we had to do two sections of Pat's chair.  I picked two points at which to "cut" the chair.  Where the chair was cut, I poched to show that these were the parts that had been cut.  A section shows what is inside the structure.  In a house or other building, a section would show the pipes and wiring within a wall.  These are features not normally seen in an elevation or plan drawing.  

Boundaries are a way of defining a space.  My drawing actually shows a lack of boundaries.  This is determined by the edges and lines that just fade out instead of coming to a definite end.  Boundaries are currently an important topic and issue in the Pathways, Edges, and Boundaries project for studio.  We are designing and installing artifacts for each given space, however, each space has certain boundaries.  Some are definite, such as street curbs or sidewalks and others, such as the wires that run for the emergency pole, are not clear boundaries.

Each one of these words comes from at least on class specifically.  I relate sections more towards drafting.  Vignettes to drawing.  Boundaries toward studio.  Scale goes towards all and is seen in all, because scale is a major part of drawing quality and architectural details and accomplishments.