An important aspect of making a Code of Ethics a workable document is to make sure that it is not at odds with other important statements such as Mission Statements, Company Purpose, Our Philosophy, and Our Creed. For simplicity, I shall refer to all of them as Mission Statements.
Once you know that your code of ethics contains the right sorts of statements the next step is to evaluate any Mission Statement. If one does not exist this points to a cultural problem. It may be unclear what the point of the group is.
My preference is for Mission Statements to align with Codes of Ethics and not the other way around.
A lexicographical analysis is the starting point of any comparison. This is followed by a semantic analysis.