With the recent news that Lester Erb has left the Iowa Hawkeyes football program, that makes six coaches over the past two years who have moved on.
As the Cedar Rapids Gazette detailed, that is equal to the amount of staff turnover that had occurred over the previous 12 years.
None of those coaches were fired, though one is left to wonder if they were pushed out. After all, head coach Kirk Ferentz has felt the fans' ire over the past few years.
In effect, it is worth looking at the coaches who have moved on, what they brought to the program and whether Iowa is better off with some new blood.
It's difficult to gauge a coach's effectiveness, but there is tangible evidence which could give an indication as to how good a coach he was.
The criteria will concern recruiting, attrition, discipline and player development.
In the modern world where everybody knows everything about everyone, recruiting is fairly open. Consequently, thanks to Rivals, which lists which coach recruited which player, fans know how effective the coaches have been. This element of the criteria does not concern itself with whether the recruited player developed, only how successful the coach was on the recruiting front.
Attrition and discipline are tougher to measure. In effect, there are no hard numbers to gauge them. There is only the eye test and the depth of my memory.
Finally, development will concern itself with how many players in a position group developed under a specific coach. Therefore, a coach who led a 5-star player into the NFL Draft will receive credit, but a coach who has consistently done the same with 2-star players will receive even more credit.
There are, of course, other measures of a coach's effectiveness, such as game planning and in-game adjustments. Nonetheless, those are elements of the game about which outsiders couldn't make a reasonable judgment.