diff --git a/packages/CLPBN/clpbn.yap b/packages/CLPBN/clpbn.yap
index 8f330aed0..4df0a4e9a 100644
--- a/packages/CLPBN/clpbn.yap
+++ b/packages/CLPBN/clpbn.yap
@@ -235,12 +235,13 @@ project_attributes(GVars, _AVars0) :-
 	use_parfactors(on),
 	clpbn_flag(solver, Solver), Solver \= fove, !,
 	generate_network(GVars, GKeys, Keys, Factors, Evidence),
-	solver(Solver),
-	call_ground_solver(Solver, GKeys, Keys, Factors, Evidence, Answ),
-	writeln(Answ).
-project_attributes(GVars, AVars0) :-
+	(ground(GVars) ->
+	    true
+	;
+	    call_ground_solver(Solver, GKeys, Keys, Factors, Evidence, Answ)
+	).
+project_attributes(GVars, AVars) :-
 	suppress_attribute_display(false),
-	generate_vars(GVars, AVars0, AVars),
 	AVars = [_|_],
 	solver(Solver),
 	( GVars = [_|_] ; Solver = graphs), !,
diff --git a/packages/CLPBN/clpbn/bp.yap b/packages/CLPBN/clpbn/bp.yap
index ba7908c0c..2190bdf18 100644
--- a/packages/CLPBN/clpbn/bp.yap
+++ b/packages/CLPBN/clpbn/bp.yap
@@ -76,9 +76,9 @@ call_bp_ground(QueryKeys, AllKeys, Factors, Evidence, Solutions) :-
 	list_of_keys_to_ids(QueryKeys, Hash, QueryVarsIds),
 	evidence_to_ids(Evidence, Hash, EvIds, EvIdNames),
 	factors_to_ids(Factors, Hash, FactorIds),
-	set_graphical_model(FactorIds, Network, InvMap, EvIdNames),
+	init_graphical_model(FactorIds, Network, InvMap, EvIdNames),
 	run_ground_solver(Network, QueryVarsIds, EvIds, Solutions),
-	free_bayesian_network(Network).
+	free_graphical_model(Network).
 
 keys_to_ids([], _, Hash, Hash).
 keys_to_ids([Key|AllKeys], I0, Hash0, Hash) :-
diff --git a/packages/CLPBN/clpbn/bp/examples/fail.yap b/packages/CLPBN/clpbn/bp/examples/fail.yap
index 32ee67091..322e9951f 100644
--- a/packages/CLPBN/clpbn/bp/examples/fail.yap
+++ b/packages/CLPBN/clpbn/bp/examples/fail.yap
@@ -1,8 +1,8 @@
 
 :- use_module(library(pfl)).
 
-:- set_clpbn_flag(solver,ve).
-%:- set_clpbn_flag(solver,fove).
+:- set_pfl_flag(solver,fove).
+%:- set_pfl_flag(solver,fove).
 
 
 t(ann).
@@ -14,7 +14,6 @@ bayes p(X)::[t,f] ; [0.1, 0.3] ; [t(X)].
 
 % use standard Prolog queries: provide evidence first.
 
-?- p(ann,t), p(ann,X).
-
+?- p(dave,t), p(ann,X).
 % ?- p(ann,X).
 
diff --git a/packages/CLPBN/clpbn/ground_factors.yap b/packages/CLPBN/clpbn/ground_factors.yap
index 0e3d93ce6..baedf0453 100644
--- a/packages/CLPBN/clpbn/ground_factors.yap
+++ b/packages/CLPBN/clpbn/ground_factors.yap
@@ -17,6 +17,7 @@
 
 :- use_module(library(lists), [
           delete/3,
+	  nth0/3,
 	  member/2]).
 
 :- use_module(library(pfl), [
@@ -29,24 +30,55 @@
 
 :- dynamic currently_defined/1, f/3.
 
-generate_network(QueryVars, QueryKeys, Keys, Factors, Evidence) :-
+generate_network(QueryVars0, QueryKeys0, Keys, Factors, Evidence) :-
 	attributes:all_attvars(AVars),
-	check_for_evidence(AVars, EVars, Evidence),
+	keys(QueryVars0, QueryKeys0),
+	check_for_evidence(AVars, EVars, QueryKeys0, QueryVars0, Evidence),
+	check_for_extra_bindings(QueryVars0, QueryVars, QueryKeys0, QueryKeys),
+	do_network(QueryVars, EVars, Keys, Factors).
+
+do_network([], _, _, _) :- !.
+do_network(QueryVars, EVars, Keys, Factors) :-
 	retractall(currently_defined(_)),
 	retractall(f(_,_,_)),
-	initialize_evidence(EVars),
-	keys(QueryVars, QueryKeys),
 	run_through_factors(QueryVars),
 	run_through_factors(EVars),
 	findall(K, currently_defined(K), Keys),
 	findall(f(FType,FKeys,FCPT), f(FType,FKeys,FCPT), Factors).
 
-check_for_evidence(V.AVars, V.EVars, (K=E).Evidence) :-
+%
+% look for attributed vars with evidence (should also search the DB)
+% verifiy if the evidence overlaps with query
+% bind query if so.
+%
+check_for_evidence(V.AVars, V.EVars, QueryKeys, QueryVars, (K=E).Evidence) :-
 	clpbn:get_atts(V,[key(K),evidence(E)]), !,
-	check_for_evidence(AVars, EVars, Evidence).
-check_for_evidence(_V.AVars, EVars, Evidence) :-
-	check_for_evidence(AVars, EVars, Evidence).
-check_for_evidence([], [], []).
+	check_for_evidence_in_query(K, QueryKeys, QueryVars, E),
+	check_for_evidence(AVars, EVars, QueryKeys, QueryVars, Evidence).
+% ignore no evidence vars
+check_for_evidence(_V.AVars, EVars, QueryKeys, QueryVars, Evidence) :-
+	check_for_evidence(AVars, EVars, QueryKeys, QueryVars, Evidence).
+check_for_evidence([], [], _, _, []).
+
+%
+% do we still have free query variables?
+%
+check_for_extra_bindings([], [], [], []).
+check_for_extra_bindings([V|QueryVars0], QueryVars, [_|QueryKeys0], QueryKeys) :-
+	nonvar(V),!,
+	check_for_extra_bindings(QueryVars0, QueryVars, QueryKeys0, QueryKeys).
+check_for_extra_bindings([V|QueryVars0], [V|QueryVars], [K|QueryKeys0], [K|QueryKeys]) :-
+	check_for_extra_bindings(QueryVars0, QueryVars, QueryKeys0, QueryKeys).
+
+
+check_for_evidence_in_query(Key, [Key|QueryKeys], [V|QueryVars], E) :- !,
+	skolem(Key, Dom),
+	nth0(E, Dom, Val),
+	V = Val,
+	check_for_evidence_in_query(Key, QueryKeys, QueryVars, E).
+check_for_evidence_in_query(Key, [_|QueryKeys], [_|QueryVars], E) :-
+	check_for_evidence_in_query(Key, QueryKeys, QueryVars, E).
+check_for_evidence_in_query(_Key, [], [], _E).
 
 keys([], []).
 keys([Var|QueryVars], [Key|QueryKeys]) :-
@@ -70,6 +102,7 @@ initialize_evidence([V|EVars]) :-
 %
 % gets key K, and collects factors that  define it
 find_factors(K) :-
+	\+ currently_defined(K),
 	assert(currently_defined(K)),
 	defined_in_factor(K, ParFactor),
 	add_factor(ParFactor, Ks),