olemus
heuristikal põhinev
=
based on heuristics

Wiktionary, adj:
1. (of an approach to problem solving, learning, or discovery) that employs a practical method not guaranteed to be optimal or perfect; not following or derived from any theory
2. (computing, of a method or algorithm) that solves a problem more quickly but is not certain to arrive at an optimal solution
3. (of an argument) that reasons from the value of a method or principle that has been shown by experimental investigation to be a useful aid in learning, discovery and problem-solving