Rather, the intensity of adult support depends on where the task falls within the child's  zone. 
( Rather ( , ( ( ( the intensity ) ( of ( adult support ) ) ) ( ( depends ( on ( where ( ( the task ) ( falls ( within ( ( the ( child 's ) ) zone ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Rather)) (, ,) (NP (NP (DT the) (NN intensity)) (PP (IN of) (NP (JJ adult) (NN support)))) (VP (VBZ depends) (PP (IN on) (SBAR (WHADVP (WRB where)) (S (NP (DT the) (NN task)) (VP (VBZ falls) (PP (IN within) (NP (NP (DT the) (NN child) (POS 's)) (NN zone)))))))) (. .)))
Adult support might support weaker child than stronger child.
( ( Adult support ) ( ( might ( ( support ( weaker child ) ) ( than ( stronger child ) ) ) ) . ) )
(ROOT (S (NP (JJ Adult) (NN support)) (VP (MD might) (VP (VB support) (NP (JJR weaker) (NN child)) (PP (IN than) (NP (JJR stronger) (NN child))))) (. .)))