Suppose that you delivered the Excel files you generated in the Assigning tasks by filtering priorities tutorial earlier in the chapter. You gave the
b_bouchard.xls to Benjamin Bouchard, the senior programmer. You also gave the other Excel file to a project leader who is going to assign the tasks to different programmers. Now they are giving you back the worksheets, with a new column indicating the progress of the development. In the case of the shared file, there is also a column with the name of the programmer who is working on every issue. Your task is now to unify those sheets.
Here is what the Excel files look like: