In research we turn problems into study designs, designs into data, and data into reports. With so much involved in the process, it's easy to get caught up in describing everything - detailing every nuance of the design and noting every data point.
Keep the report short and concise. There's always room in the appendix to be thorough and show it all.
Remember, short is memorable.
Inspired by: http://getnashty.com/write-less