The phrase "and based on countless" is correct and usable in written English.
It can be used when introducing a conclusion or statement that relies on a large number of examples, experiences, or data points.
Example: "The findings of this study are significant and based on countless hours of research conducted over the past year."
Alternatives: "and relying on numerous" or "and drawing from many".
What's more, the print industry shrinks at annual double digit levels, Time Inc's cost basis makes it largely noncompetitive in the new content world, and, based on its countless efforts, the company's ability to perform in a technology-driven market is nil.
Many called it a movement and based on the countless bloggers, vloggers, curl connoisseurs and products that popped up in 2012 that's a pretty safe assumption.
Expressionless faces illuminated by the deadening LCD glare of tablet screens, they sit around, plugged into the home they had intended to leave behind, able to research every flight, hotel and restaurant in advance based on countless peer reviews.
Expressionless faces illuminated by the deadening LCD glare of tablet screens, they sit plugged into the home they intended to leave behind, able to research every flight, hotel, and restaurant in advance based on countless peer reviews.
In the video description, Lakritz said she has wanted to tackle this project for a long time, "based on countless conversations and experiences I've had as an Orthodox Jewish feminist". "That's right," she added, "I'm 'one of those.'" In the video, Lakritz plays three different characters who voice critiques of Orthodox feminism she has heard in real life.
Even the simplest of concepts - how much capital a bank has - is a number based on countless calculations that, let's face it, are not much better than guesswork.
His clinical research was largely unfunded, empirical, and based on his observations among the countless patients he personally cared for.
But based on the countless times I've heard (in e-mails from progressive-minded readers as well as in conversations with peers) the line "I'm not a feminist, but …," I'm inclined to call your large-scale bluff.
