Time Comparison - A reference to No or Personal grades

Grades are important for selecting your challenges and to measure real progress. At the same time, many climbers want to stay away from personal gradings as it sometimes create polemics. Time Comparison Grading (TCG) can be used as a grade reference for both the guys who want to share or stay away from personal grades. If the prerequisites are the same when it comes to; Beta, Style, Condition and Form, one could speculate that there are one grade step in between; Onsight, Flash, 1, 4 or 30 sessions invested, see the TCG diagram. There are of course many exceptions and some climbers have a more steep or flat performance curve, also depending on type of rock. Once you have done a personal best you should be able to enjoy personal best' in all other Time/Effort categories. TCG is the base 8a have used when we have speculated on both down - and upgradings over the years and it might be the best way to explain how gradings work in practice. Please feel free to share your opinion.