'tried and true method' is correct and usable in written English.
You can use this phrase when talking about a method or approach that has been used successfully in the past and takes a conservative approach. For example: "We decided to use the tried and true method of creating a budget to make sure we could meet our goals."
But for the time being, climbing is the only tried and true method.
Why not stick to that tried and true method, rather than spend money on another wasteful, albeit good-intentioned idea?
Even more common is the tried and true method Chatham College, a women's college in Pittsburgh, has put in place.
Beating up on gay people is, it seems, still a tried and true method of rallying a certain section of the conservative base.
Failing these, you can always fall back on the tried and true method of frying the vegetables until golden and crisp.
(One question central banks may face is how to generate higher inflation given excess capacity; the British case points to one tried and true method: depreciation).
"Usually, these are tried and true methods of drawing away the public eye from more tangible problems.
There are a host of tried and true methods to get money out of the company short of selling it.
If only our efforts at apprehending terrorists had trusted these tried and true methods early on in the "war on terror".
Instead, they rely on tried and true methods, such as calling the number on a doctor's business card, inquiring about his past patients; a lost pouch of diamonds was allegedly once returned to its American owner in this way.
But when it comes to drinkable sunscreens, they should be seen as "backup protection", according to Wu. "I think the science is still early and we have to be careful before we talk about replacing tried and true methods," Sivamani adds.
