By Mike Munzenrider
This story from i Watch News, with help from the Center for Public Integrity, details how White House visitor logs don't reflect actual visits and visitors to the White House.
The investigation went through more than 1,000,000 records of visitors and compared the records to who actually showed up and who they met with. Over 200,000 of the records do not detail what took place during the visits, and there are over 200,000 records of visits that never happened.
Beyond on the ground reporting, the reporters must have set up databases and spreadsheets to analyze all the data. This could potentially involve HTML coding skills and would require skills with spreadsheets and a little math.