Why do we write things down?

CrossFit Handbook:
CrossFit's foundation is a precise definitions of fitness that can be measured, observed, and repeated.
This measurable and repeatable improvement in health and performance led to the adoption of CrossFit as the principal strength and conditioning program.
...measurable results ensures the constant evolution of the program as better methods are discovered and validated.
To measure our progress, to measure repeatable improvement we have to remember those specific movements, weights and reps.
SO let's start writing down our Strength day and our WODs!