diff --git a/src/tactic/generic_model_converter.cpp b/src/tactic/generic_model_converter.cpp
new file mode 100644
index 000000000..f8a701003
--- /dev/null
+++ b/src/tactic/generic_model_converter.cpp
@@ -0,0 +1,87 @@
+/*++
+Copyright (c) 2017 Microsoft Corporation
+
+Module Name:
+
+    generic_model_converter.cpp
+
+Abstract:
+
+    Generic model converter that hides and adds entries.
+    It subsumes filter_model_converter and extension_model_converter.
+
+Author:
+
+    Nikolaj Bjorner (nbjorner) 2017-10-29
+
+Notes:
+
+--*/
+#include "ast/ast_pp.h"
+#include "tactic/generic_model_converter.h"
+#include "model/model_v2_pp.h"
+#include "model/model_evaluator.h"
+
+
+void generic_model_converter::operator()(model_ref & md, unsigned goal_idx) {
+    std::cout << "model converter\n";
+    TRACE("model_converter", tout << "before generic_model_converter\n"; model_v2_pp(tout, *md); display(tout););
+    model_evaluator ev(*(md.get()));
+    ev.set_model_completion(false);
+    ev.set_expand_array_equalities(false);
+    expr_ref val(m);
+    unsigned arity;
+    for (unsigned i = m_entries.size(); i-- > 0; ) {
+        entry const& e = m_entries[i];
+        switch (e.m_instruction) {
+        case HIDE:
+            std::cout << "hide " << e.m_f << "\n";
+            md->unregister_decl(e.m_f);
+            break;
+        case ADD:
+            ev(e.m_def, val);
+            std::cout << e.m_f << " " << e.m_def << " " << val << "\n";
+            TRACE("model_converter", tout << e.m_f->get_name() << " ->\n" << e.m_def << "\n==>\n" << val << "\n";);
+            arity = e.m_f->get_arity();
+            if (arity == 0) {
+                md->register_decl(e.m_f, val);
+            }
+            else {
+                func_interp * new_fi = alloc(func_interp, m, arity);
+                new_fi->set_else(val);
+                md->register_decl(e.m_f, new_fi);
+            }
+            break;
+        }
+    }
+    TRACE("model_converter", tout << "after generic_model_converter\n"; model_v2_pp(tout, *md););
+}
+
+void generic_model_converter::display(std::ostream & out) {
+    for (entry const& e : m_entries) {
+        switch (e.m_instruction) {
+        case HIDE:
+            display_del(out, e.m_f);
+            break;
+        case ADD:
+            display_add(out, m, e.m_f, e.m_def);
+            break;
+        }
+    }
+}
+
+model_converter * generic_model_converter::translate(ast_translation & translator) {
+    ast_manager& to = translator.to();
+    generic_model_converter * res = alloc(generic_model_converter, to);
+    for (entry const& e : m_entries) 
+        res->m_entries.push_back(entry(translator(e.m_f.get()), translator(e.m_def.get()), to, e.m_instruction));
+    return res;
+}
+
+void generic_model_converter::collect(ast_pp_util& visitor) { 
+    m_env = &visitor.env(); 
+    for (entry const& e : m_entries) {
+        visitor.coll.visit_func(e.m_f);
+        if (e.m_def) visitor.coll.visit(e.m_def);
+    }
+}
diff --git a/src/tactic/generic_model_converter.h b/src/tactic/generic_model_converter.h
new file mode 100644
index 000000000..434514ce6
--- /dev/null
+++ b/src/tactic/generic_model_converter.h
@@ -0,0 +1,62 @@
+/*++
+Copyright (c) 2017 Microsoft Corporation
+
+Module Name:
+
+    generic_model_converter.h
+
+Abstract:
+
+    Generic model converter that hides and adds entries.
+    It subsumes filter_model_converter and extension_model_converter.
+
+Author:
+
+    Nikolaj Bjorner (nbjorner) 2017-10-29
+
+Notes:
+
+--*/
+#ifndef GENERIC_MODEL_CONVERTER_H_
+#define GENERIC_MODEL_CONVERTER_H_
+
+#include "tactic/model_converter.h"
+
+class generic_model_converter : public model_converter {
+    enum instruction { HIDE, ADD };
+    struct entry {
+        func_decl_ref m_f;
+        expr_ref      m_def;
+        instruction   m_instruction;
+        entry(func_decl* f, expr* d, ast_manager& m, instruction i):
+            m_f(f, m), m_def(d, m), m_instruction(i) {}
+    };
+    ast_manager& m;
+    vector<entry> m_entries;
+public:
+    generic_model_converter(ast_manager & m): m(m) {}
+    
+    virtual ~generic_model_converter() { }
+    
+    void hide(func_decl * f) { m_entries.push_back(entry(f, 0, m, HIDE)); }
+
+    void add(func_decl * d, expr* e) { m_entries.push_back(entry(d, e, m, ADD)); }
+    
+    virtual void operator()(model_ref & md, unsigned goal_idx);
+
+    virtual void operator()(svector<symbol> & labels, unsigned goal_idx) {}
+    
+    virtual void operator()(model_ref & md) { operator()(md, 0); } 
+
+    virtual void cancel() {}
+
+    virtual void display(std::ostream & out);
+
+    virtual model_converter * translate(ast_translation & translator);
+
+    virtual void collect(ast_pp_util& visitor);
+};
+
+typedef ref<generic_model_converter> generic_model_converter_ref;
+
+#endif