Explanation building is the inverse  starting with the observations, the evaluator develops a picture of what is happening and why.
( ( ( Explanation building ) ( is ( ( the inverse ) ( starting ( with ( the observations ) ) ) ) ) ) ( , ( ( the evaluator ) ( ( develops ( ( ( ( ( a picture ) ( of what ) ) ( is happening ) ) and ) why ) ) . ) ) ) )
(ROOT (S (S (NP (NN Explanation) (NN building)) (VP (VBZ is) (NP (NP (DT the) (NN inverse)) (VP (VBG starting) (PP (IN with) (NP (DT the) (NNS observations))))))) (, ,) (NP (DT the) (NN evaluator)) (VP (VBZ develops) (SBAR (SBAR (WHNP (NP (DT a) (NN picture)) (WHPP (IN of) (WHNP (WP what)))) (S (VP (VBZ is) (VP (VBG happening))))) (CC and) (SBAR (WHADVP (WRB why))))) (. .)))
Explanation building is going to be the standard approach in the future.
( ( Explanation building ) ( ( is ( going ( to ( be ( ( the ( standard approach ) ) ( in ( the future ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NN Explanation) (NN building)) (VP (VBZ is) (VP (VBG going) (S (VP (TO to) (VP (VB be) (NP (NP (DT the) (JJ standard) (NN approach)) (PP (IN in) (NP (DT the) (NN future))))))))) (. .)))