I have read and re-read The National Tennis Rating Program (NTRP) many times to determine where my opponents and I fit. After three years of playing many competitive local 3.5 and 4.0 matches I have come to believe that the NTRP ALONE is NOT a reliable indicator of one's playing ability/skill level. Many of the category descriptions are too vague and do not clearly emphasize the mental capacity needed at the different levels for good player point construction and the physical stamina needed to endure a long three set match. Too often players inaccurately rate themselves either too low or too high, sometimes to "sandbag" or mostly out of ignorance. People have many different interpretation of what each NTRP rating means as proven by one of the NTRP posts here asking us to rate the player video with the fast serve and nice forehand. Responses ranged from 4.0 to 5.5 - all of us saw the same video. A better indicator of ability would be to modify the NTRP slightly to incorporate more specific mental and physical fitness descriptions and the tactics and strategy neccesary to win COMBINED with one's personal match winning percentage. For example, If a player is winning most of their matches at 4.0 in two sets then they are probably a weak 4.5 with everything else being equal, even though another 4.5 player may have better strokes. I had a difficult time winning matches against 3.5 because my mental game was not mature. My winning opponents would often sincerely comment that I had much better strokes than they and should have won. Now, I am a 4.0 because I got my mental game under control which reduced my unforced errors. YOUR THOUGHTS ON MODIFYING THE RATING SYSTEM?