I never imagined myself using a calendar as some sort of planner, where I will have to write my activities. In the past, I only used a planner just to know what the date is, as I tend to forget it. I never wrote on a calendar. There was no use, anyway, since I rarely check it so I just end up memorizing my commitments inside my head.
The human brain, however, has its limit. Given its maximum potential, it can only realistically store a fraction of memories, especially when it (the brain) is not functioning well. It can also be noted that this potential applies less on short-term memory. Once someone reads a long note, he/she cannot possible memorize it immediately, assuming that he/she has normal memorization skills.
So what's happening to me these days is this. Things to do get more and more every minute. Meet this, do this, submit this on this time, go to this place, talk to this, etc. I cannot memorize all of them anymore. Without anything like a calendar with a planner, I am bound to forget something or scramble them--and those are some of the least things anyone would like to do.
This is a very typical situation inside the office. That's why it is no wonder that calendars proliferate an office room--along with the dozens of planners that workers bring along with them. Calendars are one of those must-haves items. Their absence is a nightmare. Have you imagined a world without these planners? The mere idea is daunting.
Oh yes, I guess the calendar will be one of my best friends now.