Scheduling - Is it part of me?

Scheduling is something I do
Conflicting objectives I consider
Disturbances and variabilities I handle
To improve performance measures further

Can be simple or complex
Depending on what is to be set
The advantages of scheduling I understand
But do not apply in my life

Life is too much to be followed through
With planned schedules through reschedule
My life is full of ups and downs
With no known distributions to use

My life, at certain times, is a mess
Not even the presence of schedules could revise
I decide what I ought to do
Not constrained by those schedules that I do