The MLB draft will be held Monday to Wednesday, and what will follow both the first round and the whole process is the assigning of grades.

Forgive me if I do not take them all too seriously. Then again, I do not take much out of the same ritual with, say, the NFL draft. And that involves players who have all played in college, for multiple years, mostly against like competition on uniform fields.

For the MLB draft, there will be high school and college players selected. Those in college often will be playing against somewhat like competition, but with aluminum bats in use. The high school uniformity of skill and surface are drastically different. Often scouts are weighing, say, a 17-year-old against an opponent who might be a few weeks away from graduating high school and going directly into his father’s plumbing supply business.

To instantly read how any team came out of this kind of forum is, at best, a wild guess supported by some evidence. Perspective is needed. What we really should be doing is reviewing the six drafts from 2008-13. Why?

Through Thursday there had been 1,080 players used in 2018. Of those, 800 came via the draft, or 74.1 percent of the overall players — a message that teams better be doing well in finding foreign amateur talent as well, because it is roughly one-quarter of rosters.

There were still three players from the 1998 draft, and Cleveland’s Shane Bieber was promoted and started Thursday to make it three players from the 2016 draft. Those form the edges of a bell curve that peaks from 2008-13, which accounts for 519 of the players in the majors. That is 64.6 percent of all drafted players, or roughly two out of every three in 2018.

A wider period, rather than one draft, is needed for examination, because high school players could take longer to reach and establish themselves in the majors than those from college.

In the period before the trade deadline, when teams need to augment their rosters, the most common player promoted this year is coming from that period of drafts, notably 2011-13, which account for the most of any three-year period (300 players).

Even with perspective and a lot more information, trying to assess those drafts is imperfect. They may cross administrations (though often a change in GM does not result with an immediate overhaul of the amateur scouts). Also, simply putting a player in the majors is informative, but needs further delving because there is a difference between attendance and impact.

The Mets highlight both of those items. Their drafts in the 2008-13 period were overseen first by Omar Minaya and then Sandy Alderson. In all, they have 25 players from those drafts who played this year, tied with the Blue Jays for the most.

Players from the Minaya era include Jake deGrom, Matt Harvey and Steven Matz. Alderson’s first pick, Brandon Nimmo (13th overall, 2011) is beginning to make an impact, Michael Fulmer was used to get Yoenis Cespedes, and Seth Lugo and Robert Gsellman have turned into important staff pieces. But much of this period is about attendance, which does have its importance since almost every team will end up using 40-plus players this season.

No team has put more players in the majors this year from the 2012 draft than the Mets’ nine (the other four NL East teams had a combined eight). But those nine players are Kevin Plawecki, Matt Reynolds, Matt Koch, Corey Oswalt, Tomas Nido, Paul Sewald, Chris Flexen, Tim Peterson and Matt Bowman. It does not include (at least not yet) Gavin Cecchini, taken 12th overall in 2012 and arguably the worst draft decision of Alderson’s reign.

The Yankees had the third-largest drafted group from 2008-13 (22) playing in the majors this year. There are mainly depth position (Tyler Austin, Ben Gamel and Rob Refsnyder) and bullpen pieces (Adam Warren, Shane Greene and Tommy Kahnle), but also Greg Bird and Aaron Judge.

Not having big numbers does not doom a team. The Red Sox and Indians (12), and Dodgers and Nationals (14) are among the teams with the fewest players in the majors from those drafts. But if that is the case, you better get some significant impact.

The Red Sox snagged Mookie Betts, plus Jackie Bradley Jr. and Travis Shaw. The Indians: Francisco Lindor, Cody Allen and Jason Kipnis plus Clint Frazier, who helped them get Andrew Miller from the Yankees. The Dodgers: Corey Seager, Cody Bellinger and the emerging Ross Stripling. The Nationals have not done great without a top pick, but they turned three of those high selections into Stephen Strasburg, Bryce Harper and Anthony Rendon.

Conversely, at times the small numbers are revelatory. After a period of championship contention built around a drafted haul such as Cole Hamels, Ryan Howard, Jimmy Rollins and Chase Utley, the Phillies have fallen in recent years and having a major-league-low 10 players this year from the 2008-13 drafts is a reason. The best was Ken Giles.

The Tigers also have followed serial contention with a slide and have just 13 drafted players in the majors from that period, the best of whom is Nick Castellanos and the second-best might be Chad Green.

The Rays (five of the top 71) and Royals (five of the top 58) have the most picks Monday on Day 1 of this draft. They are among the teams that have gotten the least production to date from those 2008-13 drafts. Tampa Bay took Tim Beckham with the No. 1-overall pick in the 2008 process rather than Florida State’s Buster Posey. The Rays’ best player from this span is Kevin Kiermaier (31st round, 2010) and the rising Blake Snell (52nd-overall pick in 2011).

The Royals took Eric Hosmer with the third-overall pick in 2008, which concluded an era of high first-round picks with Alex Gordon (second pick in 2005) and Mike Moustakas (second pick in 2007) that helped form the cornerstone for a title. But since then the best they have drafted is Whit Merrifield or Wil Myers, who they did turn into championship closer Wade Davis.

Will the Rays and Royals seize this moment to significantly stock their system? I will let you know in five years.