Have 4 years worth of annual surveys that need to be merged into one SPSS file. MOST of the questions have remained the same (those that have been deleted over the years can be left out of the final data set). Each year's survey may have used different variable names for the same attribute and in some cases may also have utilized scales that were the same number (usually 5pt) but in ascending vs descending scale order. Need to clean up and merge files into one master SPSS file. If this task makes sense and is something you would feel comfortable doing please apply. High level of attention to detail required! Each years survey is about a 10 min long survey written in english and is about employee benefits.