Well log matching is the best proof of the efficacy of an inversion system. I say ADAPS beats the Thinman and Sparce Spike inversions hands down. To see a great set of ADAPS before and after examples go to http://adaps.com/a/examples.pps . This is a PowerPoint, so be prepared to wait. The seismic masquerade./ The bulk of today's interpretations are based on uncorrected seismic sections such as we see on the immediate right. Quite pretty, but not true lithology. Instead they show the complex overlap of many individual primary events, from both the tops and the bottoms of multiple layers. We call this seismic tuning. To the right, we see an equivalent section that is de-tuned. The superimposed well log images tend to prove that tuning existed, and that individual event picks before correction should be held in question. Linear vs non-linear techniques - When problems get very complex, linear equations sometimes are not adequate. My adventure in non linear thinking began back in the 1960's when I wrote the first predictive deconvolution program, as manager of digital operations for Western Geophysical . This program iterated on wavelet shape in a simple minded way. This system put Western ahead in the new field. ADAPS itself took shape in 2000, and I spent the next few years in an effort to get seismic R&D to take non-linear work seriously. Ikon Science finally did, and their version or my early logic is published in their RocDoc package.