There are many things that go into your data collection strategy. It is important that you take the proper steps and think about how you will execute you statistic data collection long before you get started. In many cases people will not completely think their data collection strategy though and it will result in useless data. By having a solid data collection strategy in place before you go to work you will be able to just collect the data and not have to worry about significant corruption from outside influences.
Initial Steps To Planning Your Data Collection Strategy