diff --git a/scripts/mk_project.py b/scripts/mk_project.py
index 77bb1b680..534e597ef 100644
--- a/scripts/mk_project.py
+++ b/scripts/mk_project.py
@@ -40,6 +40,7 @@ def init_project_def():
     add_lib('model',  ['macros'])
     add_lib('converters', ['model'], 'ast/converters')
     add_lib('simplifiers', ['euf', 'normal_forms', 'bit_blaster', 'converters', 'substitution'], 'ast/simplifiers')
+    add_lib('ast_sls', ['ast'], 'ast/sls')
     add_lib('tactic', ['simplifiers'])
     add_lib('mbp', ['model', 'simplex'], 'qe/mbp')
     add_lib('qe_lite', ['tactic', 'mbp'], 'qe/lite')
@@ -64,7 +65,7 @@ def init_project_def():
     add_lib('bv_tactics', ['tactic', 'bit_blaster', 'core_tactics'], 'tactic/bv')
     add_lib('fuzzing', ['ast'], 'test/fuzzing')
     add_lib('smt_tactic', ['smt'], 'smt/tactic')
-    add_lib('sls_tactic', ['tactic', 'normal_forms', 'core_tactics', 'bv_tactics'], 'tactic/sls')
+    add_lib('sls_tactic', ['tactic', 'normal_forms', 'core_tactics', 'bv_tactics', 'ast_sls'], 'tactic/sls')
     add_lib('qe', ['smt', 'mbp', 'qe_lite', 'nlsat', 'tactic', 'nlsat_tactic'], 'qe')
     add_lib('sat_solver', ['solver', 'core_tactics', 'aig_tactic', 'bv_tactics', 'arith_tactics', 'sat_tactic'], 'sat/sat_solver')
     add_lib('fd_solver', ['core_tactics', 'arith_tactics', 'sat_solver', 'smt'], 'tactic/fd_solver') 
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index a12571f35..4c09f31aa 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -54,6 +54,7 @@ add_subdirectory(ast/euf)
 add_subdirectory(ast/converters)
 add_subdirectory(ast/substitution)
 add_subdirectory(ast/simplifiers)
+add_subdirectory(ast/sls)
 add_subdirectory(tactic)
 add_subdirectory(qe/mbp)
 add_subdirectory(qe/lite)
diff --git a/src/tactic/sls/bvsls_opt_engine.cpp b/src/ast/sls/bvsls_opt_engine.cpp
similarity index 99%
rename from src/tactic/sls/bvsls_opt_engine.cpp
rename to src/ast/sls/bvsls_opt_engine.cpp
index 37454ca72..e4c96d735 100644
--- a/src/tactic/sls/bvsls_opt_engine.cpp
+++ b/src/ast/sls/bvsls_opt_engine.cpp
@@ -17,7 +17,7 @@ Notes:
 
 --*/
 #include "ast/normal_forms/nnf.h"
-#include "tactic/sls/bvsls_opt_engine.h"
+#include "ast/sls/bvsls_opt_engine.h"
 
 bvsls_opt_engine::bvsls_opt_engine(ast_manager & m, params_ref const & p) :
     sls_engine(m, p),
diff --git a/src/tactic/sls/bvsls_opt_engine.h b/src/ast/sls/bvsls_opt_engine.h
similarity index 98%
rename from src/tactic/sls/bvsls_opt_engine.h
rename to src/ast/sls/bvsls_opt_engine.h
index c6b3857af..435fa3af4 100644
--- a/src/tactic/sls/bvsls_opt_engine.h
+++ b/src/ast/sls/bvsls_opt_engine.h
@@ -18,7 +18,7 @@ Notes:
 --*/
 #pragma once
 
-#include "tactic/sls/sls_engine.h"
+#include "ast/sls/sls_engine.h"
 
 class bvsls_opt_engine : public sls_engine {
     sls_tracker   & m_hard_tracker;
diff --git a/src/tactic/sls/sls_engine.cpp b/src/ast/sls/sls_engine.cpp
similarity index 94%
rename from src/tactic/sls/sls_engine.cpp
rename to src/ast/sls/sls_engine.cpp
index 58676edfb..8b4253747 100644
--- a/src/tactic/sls/sls_engine.cpp
+++ b/src/ast/sls/sls_engine.cpp
@@ -26,8 +26,8 @@ Notes:
 #include "tactic/tactic.h"
 #include "util/luby.h"
 
-#include "tactic/sls/sls_params.hpp"
-#include "tactic/sls/sls_engine.h"
+#include "params/sls_params.hpp"
+#include "ast/sls/sls_engine.h"
 
 
 sls_engine::sls_engine(ast_manager & m, params_ref const & p) :
@@ -52,7 +52,6 @@ sls_engine::~sls_engine() {
 
 void sls_engine::updt_params(params_ref const & _p) {
     sls_params p(_p);
-    m_produce_models = _p.get_bool("model", false);
     m_max_restarts = p.max_restarts();
     m_tracker.set_random_seed(p.random_seed());
     m_walksat = p.walksat();
@@ -523,38 +522,6 @@ bailout:
     return res;
 }
 
-void sls_engine::operator()(goal_ref const & g, model_converter_ref & mc) {
-    if (g->inconsistent()) {
-        mc = nullptr;
-        return;
-    }
-
-    m_produce_models = g->models_enabled();
-
-    for (unsigned i = 0; i < g->size(); i++)
-        assert_expr(g->form(i));    
-
-    lbool res = operator()();
-
-    if (res == l_true) {
-        report_tactic_progress("Number of flips:", m_stats.m_moves);
-        for (unsigned i = 0; i < g->size(); i++)
-            if (!m_mpz_manager.is_one(m_tracker.get_value(g->form(i))))
-            {
-                verbose_stream() << "Terminated before all assertions were SAT!" << std::endl;
-                NOT_IMPLEMENTED_YET();
-            }
-
-        if (m_produce_models) {
-            model_ref mdl = m_tracker.get_model();
-            mc = model2model_converter(mdl.get());
-            TRACE("sls_model", mc->display(tout););
-        }
-        g->reset();
-    }
-    else
-        mc = nullptr;
-}
 
 lbool sls_engine::operator()() {    
     m_tracker.initialize(m_assertions);
@@ -567,7 +534,7 @@ lbool sls_engine::operator()() {
     do {
         checkpoint();
 
-        report_tactic_progress("Searching... restarts left:", m_max_restarts - m_stats.m_restarts);
+        // report_tactic_progress("Searching... restarts left:", m_max_restarts - m_stats.m_restarts);
         res = search();
 
         if (res == l_undef)
diff --git a/src/tactic/sls/sls_engine.h b/src/ast/sls/sls_engine.h
similarity index 92%
rename from src/tactic/sls/sls_engine.h
rename to src/ast/sls/sls_engine.h
index 5f290c626..88ebb98b8 100644
--- a/src/tactic/sls/sls_engine.h
+++ b/src/ast/sls/sls_engine.h
@@ -21,10 +21,9 @@ Notes:
 #include "util/stopwatch.h"
 #include "util/lbool.h"
 #include "ast/converters/model_converter.h"
-#include "tactic/goal.h"
 
-#include "tactic/sls/sls_tracker.h"
-#include "tactic/sls/sls_evaluator.h"
+#include "ast/sls/sls_tracker.h"
+#include "ast/sls/sls_evaluator.h"
 #include "util/statistics.h"
 
 class sls_engine {
@@ -62,7 +61,6 @@ protected:
     unsynch_mpz_manager m_mpz_manager;
     powers          m_powers;
     mpz             m_zero, m_one, m_two;
-    bool            m_produce_models;
     bv_util         m_bv_util;
     sls_tracker     m_tracker;
     sls_evaluator   m_evaluator;
@@ -96,7 +94,7 @@ public:
 
     void assert_expr(expr * e) { m_assertions.push_back(e); }
 
-    // stats const & get_stats(void) { return m_stats; }
+    stats const & get_stats(void) { return m_stats; }
     void collect_statistics(statistics & st) const;
     void reset_statistics() { m_stats.reset(); }
 
@@ -111,7 +109,12 @@ public:
     lbool search();
 
     lbool operator()();
-    void operator()(goal_ref const & g, model_converter_ref & mc);
+
+    mpz & get_value(expr * n) { return m_tracker.get_value(n); }
+
+    model_ref get_model() { return m_tracker.get_model(); }
+
+    unsynch_mpz_manager& get_mpz_manager() { return m_mpz_manager; }
 
 protected:
     void checkpoint();
@@ -135,5 +138,7 @@ protected:
 
     //double get_restart_armin(unsigned cnt_restarts);    
     unsigned check_restart(unsigned curr_value);
+
+
 };
 
diff --git a/src/tactic/sls/sls_evaluator.h b/src/ast/sls/sls_evaluator.h
similarity index 99%
rename from src/tactic/sls/sls_evaluator.h
rename to src/ast/sls/sls_evaluator.h
index d386ece15..2ee03c928 100644
--- a/src/tactic/sls/sls_evaluator.h
+++ b/src/ast/sls/sls_evaluator.h
@@ -21,8 +21,8 @@ Notes:
 
 #include "model/model_evaluator.h"
 
-#include "tactic/sls/sls_powers.h"
-#include "tactic/sls/sls_tracker.h"
+#include "ast/sls/sls_powers.h"
+#include "ast/sls/sls_tracker.h"
 
 class sls_evaluator {
     ast_manager         & m_manager;
diff --git a/src/tactic/sls/sls_powers.h b/src/ast/sls/sls_powers.h
similarity index 100%
rename from src/tactic/sls/sls_powers.h
rename to src/ast/sls/sls_powers.h
diff --git a/src/tactic/sls/sls_tracker.h b/src/ast/sls/sls_tracker.h
similarity index 99%
rename from src/tactic/sls/sls_tracker.h
rename to src/ast/sls/sls_tracker.h
index 951153a5c..67723828f 100644
--- a/src/tactic/sls/sls_tracker.h
+++ b/src/ast/sls/sls_tracker.h
@@ -25,8 +25,8 @@ Notes:
 #include "ast/bv_decl_plugin.h"
 #include "model/model.h"
 
-#include "tactic/sls/sls_params.hpp"
-#include "tactic/sls/sls_powers.h"
+#include "params/sls_params.hpp"
+#include "ast/sls/sls_powers.h"
 
 class sls_tracker {
     ast_manager         & m_manager;
diff --git a/src/params/CMakeLists.txt b/src/params/CMakeLists.txt
index cdc21da97..763702caf 100644
--- a/src/params/CMakeLists.txt
+++ b/src/params/CMakeLists.txt
@@ -15,6 +15,7 @@ z3_add_component(params
     poly_rewriter_params.pyg
     rewriter_params.pyg
     seq_rewriter_params.pyg
+    sls_params.pyg
     solver_params.pyg
     tactic_params.pyg
   EXTRA_REGISTER_MODULE_HEADERS
diff --git a/src/tactic/sls/sls_params.pyg b/src/params/sls_params.pyg
similarity index 100%
rename from src/tactic/sls/sls_params.pyg
rename to src/params/sls_params.pyg
diff --git a/src/tactic/sls/CMakeLists.txt b/src/tactic/sls/CMakeLists.txt
index 436b1742f..83599b827 100644
--- a/src/tactic/sls/CMakeLists.txt
+++ b/src/tactic/sls/CMakeLists.txt
@@ -1,15 +1,12 @@
 z3_add_component(sls_tactic
   SOURCES
-    bvsls_opt_engine.cpp
-    sls_engine.cpp
     sls_tactic.cpp
   COMPONENT_DEPENDENCIES
     bv_tactics
     core_tactics
     normal_forms
     tactic
-  PYG_FILES
-    sls_params.pyg
+    ast_sls
   TACTIC_HEADERS
     sls_tactic.h
 )
diff --git a/src/tactic/sls/sls_tactic.cpp b/src/tactic/sls/sls_tactic.cpp
index e631c23e9..6daadc83b 100644
--- a/src/tactic/sls/sls_tactic.cpp
+++ b/src/tactic/sls/sls_tactic.cpp
@@ -27,8 +27,8 @@ Notes:
 #include "tactic/core/nnf_tactic.h"
 #include "util/stopwatch.h"
 #include "tactic/sls/sls_tactic.h"
-#include "tactic/sls/sls_params.hpp"
-#include "tactic/sls/sls_engine.h"
+#include "params/sls_params.hpp"
+#include "ast/sls/sls_engine.h"
 
 class sls_tactic : public tactic {    
     ast_manager    & m;
@@ -60,6 +60,38 @@ public:
     void collect_param_descrs(param_descrs & r) override {
         sls_params::collect_param_descrs(r);
     }
+
+    void run(goal_ref const& g, model_converter_ref& mc) {
+        if (g->inconsistent()) {
+            mc = nullptr;
+            return;
+        }        
+        
+        for (unsigned i = 0; i < g->size(); i++)
+            m_engine->assert_expr(g->form(i));    
+        
+        lbool res = m_engine->operator()();
+        auto const& stats = m_engine->get_stats();
+        if (res == l_true) {
+            report_tactic_progress("Number of flips:", stats.m_moves);
+            
+            for (unsigned i = 0; i < g->size(); i++)
+                if (!m_engine->get_mpz_manager().is_one(m_engine->get_value(g->form(i)))) {
+                    verbose_stream() << "Terminated before all assertions were SAT!" << std::endl;
+                    NOT_IMPLEMENTED_YET();
+                }
+
+            if (g->models_enabled()) {
+                model_ref mdl = m_engine->get_model();
+                mc = model2model_converter(mdl.get());
+                TRACE("sls_model", mc->display(tout););
+            }
+            g->reset();
+        }
+        else
+            mc = nullptr;
+        
+    }
     
     void operator()(goal_ref const & g, 
                     goal_ref_buffer & result) override {
@@ -69,7 +101,7 @@ public:
         tactic_report report("sls", *g);
         
         model_converter_ref mc;
-        m_engine->operator()(g, mc);
+        run(g, mc);
         g->add(mc.get());
         g->inc_depth();
         result.push_back(g.get());