diff --git a/TODO.md b/TODO.md
index 7029439..03b2e56 100644
--- a/TODO.md
+++ b/TODO.md
@@ -2,7 +2,8 @@
 
 * [x] Support versioning
 * [x] Test use of `plpy` from python Package
-* Add `pysal` etc. dependencies
+* [x] Add `pysal` etc. dependencies
+* Defin documentation practices (general, per extension/package?)
 * Add initial function set
 * Add integration tests
 * Make target to open a new version development (create symlinks, etc.)
diff --git a/pg/.gitignore b/pg/.gitignore
index 5d5e769..820df46 100644
--- a/pg/.gitignore
+++ b/pg/.gitignore
@@ -1,3 +1,3 @@
 regression.diffs
 regression.out
-test/results
+results/
diff --git a/pg/sql/0.0.1/01_random_seeds.sql b/pg/sql/0.0.1/01_random_seeds.sql
new file mode 100644
index 0000000..a3fd3c5
--- /dev/null
+++ b/pg/sql/0.0.1/01_random_seeds.sql
@@ -0,0 +1,8 @@
+-- Set the seeds of the RNGs (Random Number Generators)
+-- used internally.
+CREATE OR REPLACE FUNCTION
+cdb_random_seeds (seed_value INTEGER) RETURNS VOID
+AS $$
+  from crankshaft import random_seeds
+  random_seeds.set_random_seeds(seed_value)
+$$ LANGUAGE plpythonu;
diff --git a/pg/sql/0.0.1/02_moran.sql b/pg/sql/0.0.1/02_moran.sql
new file mode 100644
index 0000000..da2cb64
--- /dev/null
+++ b/pg/sql/0.0.1/02_moran.sql
@@ -0,0 +1,18 @@
+CREATE OR REPLACE FUNCTION
+  cdb_moran_local (
+      t TEXT,
+  	  attr TEXT,
+  	  significance float DEFAULT 0.05,
+  	  num_ngbrs INT DEFAULT 5,
+  	  permutations INT DEFAULT 99,
+  	  geom_column TEXT DEFAULT 'the_geom',
+  	  id_col TEXT DEFAULT 'cartodb_id',
+  	  w_type TEXT DEFAULT 'knn',
+      random_seed INTEGER DEFAULT NULL
+  )
+RETURNS TABLE (moran FLOAT, quads TEXT, significance FLOAT, ids INT)
+AS $$
+  from crankshaft.clustering import moran_local
+  # TODO: use named parameters or a dictionary
+  return moran_local(t, attr, significance, num_ngbrs, permutations, geom_column, id_col, w_type, random_seed)
+$$ LANGUAGE plpythonu;
diff --git a/pg/sql/0.0.1/03_overlap_sum.sql b/pg/sql/0.0.1/03_overlap_sum.sql
new file mode 100644
index 0000000..f30f694
--- /dev/null
+++ b/pg/sql/0.0.1/03_overlap_sum.sql
@@ -0,0 +1,20 @@
+-- Function by Stuart Lynn for a simple interpolation of a value
+-- from a polygon table over an arbitrary polygon
+-- (weighted by the area proportion overlapped)
+CREATE OR REPLACE
+FUNCTION cdb_overlap_sum(geom geometry, target_table_name text, target_column text)
+  RETURNS numeric AS
+$$
+DECLARE
+	result numeric;
+BEGIN
+  EXECUTE Format('
+    SELECT sum(%I*ST_Area(St_Intersection($1, a.the_geom))/ST_Area(a.the_geom))
+    FROM %I AS a
+    WHERE $1 && a.the_geom
+  ', target_column, target_table_name)
+  USING geom
+  INTO result;
+  RETURN result;
+END;
+$$ LANGUAGE plpgsql;
diff --git a/pg/sql/0.0.1/moran.sql b/pg/sql/0.0.1/moran.sql
deleted file mode 100644
index e93d972..0000000
--- a/pg/sql/0.0.1/moran.sql
+++ /dev/null
@@ -1,22 +0,0 @@
-CREATE OR REPLACE FUNCTION
-cdb_moran_local (
-    t TEXT,
-	  attr TEXT,
-	  significance float DEFAULT 0.05,
-	  num_ngbrs INT DEFAULT 5,
-	  permutations INT DEFAULT 99,
-	  geom_column TEXT DEFAULT 'the_geom',
-	  id_col TEXT DEFAULT 'cartodb_id',
-	  w_type TEXT DEFAULT 'knn'
-)
-RETURNS TABLE (
-    moran FLOAT,
-	  quads TEXT,
-	  significance FLOAT,
-	  ids INT
-)
-AS $$
-  from crankshaft.clustering import moran_local
-  # TODO: use named parameters or a dictionary
-  return moran_local(t, attr, significance, num_ngbrs, permutations, geom_column, id_col, w_type)
-$$ LANGUAGE plpythonu;
diff --git a/pg/sql/0.0.1/poc_xyz.sql b/pg/sql/0.0.1/poc_xyz.sql
deleted file mode 100644
index e342f68..0000000
--- a/pg/sql/0.0.1/poc_xyz.sql
+++ /dev/null
@@ -1,5 +0,0 @@
-CREATE OR REPLACE FUNCTION cdb_poc_xyz()
-RETURNS Text AS $$
-    from crankshaft.poc import xyz
-    return xyz()
-$$ LANGUAGE plpythonu;
diff --git a/pg/test/0.0.1/expected/02_moran_test.out b/pg/test/0.0.1/expected/02_moran_test.out
new file mode 100644
index 0000000..902f4c9
--- /dev/null
+++ b/pg/test/0.0.1/expected/02_moran_test.out
@@ -0,0 +1,132 @@
+\i test/fixtures/ppoints.sql
+-- test table (spanish province centroids with some invented values)
+CREATE TABLE ppoints (cartodb_id integer, the_geom geometry, the_geom_webmercator geometry, code text, region_code text, value float);
+INSERT INTO ppoints VALUES
+( 1,'0101000020E6100000A8306DC0CBC305C051D14B6CE56A4540'::geometry,ST_Transform('0101000020E6100000A8306DC0CBC305C051D14B6CE56A4540'::geometry, 3857),'01','16',0.5),
+( 4,'0101000020E6100000E220A4362DC202C0FD8AFA5119994240'::geometry,ST_Transform('0101000020E6100000E220A4362DC202C0FD8AFA5119994240'::geometry, 3857),'04','01',0.1),
+( 5,'0101000020E610000004377E573AC813C0CB5871BB17494440'::geometry,ST_Transform('0101000020E610000004377E573AC813C0CB5871BB17494440'::geometry, 3857),'05','07',0.3),
+( 2,'0101000020E610000000F49BE19BAFFFBF639958FDA6694340'::geometry,ST_Transform('0101000020E610000000F49BE19BAFFFBF639958FDA6694340'::geometry, 3857),'02','08',0.7),
+( 3,'0101000020E61000005D0B7E63C832E2BFDB63EB00443D4340'::geometry,ST_Transform('0101000020E61000005D0B7E63C832E2BFDB63EB00443D4340'::geometry, 3857),'03','10',0.2),
+( 6,'0101000020E61000006F3742B7FB9018C0DD967DC4D95A4340'::geometry,ST_Transform('0101000020E61000006F3742B7FB9018C0DD967DC4D95A4340'::geometry, 3857),'06','11',0.05),
+( 7,'0101000020E6100000E4BB36995F4C0740EAC0E5CA9FC94340'::geometry,ST_Transform('0101000020E6100000E4BB36995F4C0740EAC0E5CA9FC94340'::geometry, 3857),'07','04',0.4),
+( 8,'0101000020E61000003D43CC6CAFBEFF3F6B52E66F91DD4440'::geometry,ST_Transform('0101000020E61000003D43CC6CAFBEFF3F6B52E66F91DD4440'::geometry, 3857),'08','09',0.7),
+( 9,'0101000020E61000003CC797BD99AF0CC0495A87FA312F4540'::geometry,ST_Transform('0101000020E61000003CC797BD99AF0CC0495A87FA312F4540'::geometry, 3857),'09','07',0.5),
+(13,'0101000020E61000001CAA00A9F19F0EC05DF9267B7A764340'::geometry,ST_Transform('0101000020E61000001CAA00A9F19F0EC05DF9267B7A764340'::geometry, 3857),'13','08',0.4),
+(16,'0101000020E6100000D8208F3CBC9001C065638DC1B1F24340'::geometry,ST_Transform('0101000020E6100000D8208F3CBC9001C065638DC1B1F24340'::geometry, 3857),'16','08',0.4),
+(17,'0101000020E6100000E9E6A94A71630540AD7A0CB062104540'::geometry,ST_Transform('0101000020E6100000E9E6A94A71630540AD7A0CB062104540'::geometry, 3857),'17','09',0.6),
+(18,'0101000020E6100000719792D59E240AC098AC548E00A84240'::geometry,ST_Transform('0101000020E6100000719792D59E240AC098AC548E00A84240'::geometry, 3857),'18','01',0.3),
+(19,'0101000020E6100000972C878B50FD04C0123C881D1F684440'::geometry,ST_Transform('0101000020E6100000972C878B50FD04C0123C881D1F684440'::geometry, 3857),'19','08',0.7),
+(21,'0101000020E6100000F7893E9934511BC0EAA4BF03E1C94240'::geometry,ST_Transform('0101000020E6100000F7893E9934511BC0EAA4BF03E1C94240'::geometry, 3857),'21','01',0.1),
+(22,'0101000020E6100000572C2123B2A8B2BF7ED7FABAFD194540'::geometry,ST_Transform('0101000020E6100000572C2123B2A8B2BF7ED7FABAFD194540'::geometry, 3857),'22','02',0.4),
+(25,'0101000020E6100000461B67D688C4F03FD990EEC3A0054540'::geometry,ST_Transform('0101000020E6100000461B67D688C4F03FD990EEC3A0054540'::geometry, 3857),'25','09',0.4),
+(26,'0101000020E6100000A139FB06E82204C0539D84F62E234540'::geometry,ST_Transform('0101000020E6100000A139FB06E82204C0539D84F62E234540'::geometry, 3857),'26','17',0.6),
+(27,'0101000020E6100000A92E54E618C91DC00D3A947B81814540'::geometry,ST_Transform('0101000020E6100000A92E54E618C91DC00D3A947B81814540'::geometry, 3857),'27','12',0.3),
+(28,'0101000020E6100000971DC8B682BC0DC016D0E8055F3F4440'::geometry,ST_Transform('0101000020E6100000971DC8B682BC0DC016D0E8055F3F4440'::geometry, 3857),'28','13',0.8),
+(30,'0101000020E6100000A2DC1964A8C5F7BF19299C994D004340'::geometry,ST_Transform('0101000020E6100000A2DC1964A8C5F7BF19299C994D004340'::geometry, 3857),'30','14',0.1),
+(31,'0101000020E6100000DCA1FCC87B56FABF9B88E9D866554540'::geometry,ST_Transform('0101000020E6100000DCA1FCC87B56FABF9B88E9D866554540'::geometry, 3857),'31','15',0.9),
+(32,'0101000020E6100000E1517AFCD15E1EC0A18D8D4825194540'::geometry,ST_Transform('0101000020E6100000E1517AFCD15E1EC0A18D8D4825194540'::geometry, 3857),'32','12',0.3),
+(33,'0101000020E6100000A7FF33825AF917C0FABE7DFB6BA54540'::geometry,ST_Transform('0101000020E6100000A7FF33825AF917C0FABE7DFB6BA54540'::geometry, 3857),'33','03',0.4),
+(34,'0101000020E6100000FB4E4EBEB72412C0898E7240982F4540'::geometry,ST_Transform('0101000020E6100000FB4E4EBEB72412C0898E7240982F4540'::geometry, 3857),'34','07',0.3),
+(35,'0101000020E6100000224682B01B1A2DC011091656CC5C3C40'::geometry,ST_Transform('0101000020E6100000224682B01B1A2DC011091656CC5C3C40'::geometry, 3857),'35','05',0.3),
+(36,'0101000020E6100000F7C9447110EC20C04C5D4823C7374540'::geometry,ST_Transform('0101000020E6100000F7C9447110EC20C04C5D4823C7374540'::geometry, 3857),'36','12',0.2),
+(37,'0101000020E610000053D6A26DFB4218C09D58FAE209674440'::geometry,ST_Transform('0101000020E610000053D6A26DFB4218C09D58FAE209674440'::geometry, 3857),'37','07',0.5),
+(38,'0101000020E6100000B1D1B5FC910431C03C0C89BA03503C40'::geometry,ST_Transform('0101000020E6100000B1D1B5FC910431C03C0C89BA03503C40'::geometry, 3857),'38','05',0.4),
+(39,'0101000020E610000086E6FEE1BD1E10C00417096748994540'::geometry,ST_Transform('0101000020E610000086E6FEE1BD1E10C00417096748994540'::geometry, 3857),'39','06',0.6),
+(40,'0101000020E6100000FB51C33F733710C038D01729E4954440'::geometry,ST_Transform('0101000020E6100000FB51C33F733710C038D01729E4954440'::geometry, 3857),'40','07',0.5),
+(41,'0101000020E6100000912D6FDA28BB16C031321F08C4B74240'::geometry,ST_Transform('0101000020E6100000912D6FDA28BB16C031321F08C4B74240'::geometry, 3857),'41','01',0.4),
+(42,'0101000020E6100000554432EABEB504C069ECD78775CF4440'::geometry,ST_Transform('0101000020E6100000554432EABEB504C069ECD78775CF4440'::geometry, 3857),'42','07',0.2),
+(43,'0101000020E6100000157F117C1A2EEA3F027CD1F2368B4440'::geometry,ST_Transform('0101000020E6100000157F117C1A2EEA3F027CD1F2368B4440'::geometry, 3857),'43','09',0.3),
+(44,'0101000020E610000051AA5B1BD718EABFEE67613BA4544440'::geometry,ST_Transform('0101000020E610000051AA5B1BD718EABFEE67613BA4544440'::geometry, 3857),'44','02',0.2),
+(45,'0101000020E610000022C5C01BB69710C08563BC1499E54340'::geometry,ST_Transform('0101000020E610000022C5C01BB69710C08563BC1499E54340'::geometry, 3857),'45','08',0.3),
+(46,'0101000020E6100000D5FCF78A11A0E9BFDEA46F8E64AF4340'::geometry,ST_Transform('0101000020E6100000D5FCF78A11A0E9BFDEA46F8E64AF4340'::geometry, 3857),'46','10',0.2),
+(47,'0101000020E61000003AE63525866313C02100050B2BD14440'::geometry,ST_Transform('0101000020E61000003AE63525866313C02100050B2BD14440'::geometry, 3857),'47','07',0.3),
+(48,'0101000020E610000030F187FD1FD206C0C767E1496C9E4540'::geometry,ST_Transform('0101000020E610000030F187FD1FD206C0C767E1496C9E4540'::geometry, 3857),'48','16',0.5),
+(49,'0101000020E61000009C22867B12EC17C006C5F40C14DD4440'::geometry,ST_Transform('0101000020E61000009C22867B12EC17C006C5F40C14DD4440'::geometry, 3857),'49','07',0.2),
+(50,'0101000020E6100000F7D5EFC62D08F1BF69D1231D68CF4440'::geometry,ST_Transform('0101000020E6100000F7D5EFC62D08F1BF69D1231D68CF4440'::geometry, 3857),'50','02',0.6),
+(51,'0101000020E61000005B0E1F8DAA5F15C0530BFE285BF24140'::geometry,ST_Transform('0101000020E61000005B0E1F8DAA5F15C0530BFE285BF24140'::geometry, 3857),'51','18',0.01),
+(10,'0101000020E61000000FD65D82AEA418C06192D1351FDB4340'::geometry,ST_Transform('0101000020E61000000FD65D82AEA418C06192D1351FDB4340'::geometry, 3857),'10','11',0.04),
+(11,'0101000020E6100000B305531DAB0A17C0DEAFCD4EE5464240'::geometry,ST_Transform('0101000020E6100000B305531DAB0A17C0DEAFCD4EE5464240'::geometry, 3857),'11','01',0.08),
+(12,'0101000020E610000059721A7297C9C2BF9EBE383BE51E4440'::geometry,ST_Transform('0101000020E610000059721A7297C9C2BF9EBE383BE51E4440'::geometry, 3857),'12','10',0.2),
+(14,'0101000020E610000000C86313AF3C13C0E530879C10FF4240'::geometry,ST_Transform('0101000020E610000000C86313AF3C13C0E530879C10FF4240'::geometry, 3857),'14','01',0.2),
+(15,'0101000020E61000002A475497B6ED20C06643D4131A904540'::geometry,ST_Transform('0101000020E61000002A475497B6ED20C06643D4131A904540'::geometry, 3857),'15','12',0.3),
+(20,'0101000020E6100000F975566FAD8D01C0E840C33F67924540'::geometry,ST_Transform('0101000020E6100000F975566FAD8D01C0E840C33F67924540'::geometry, 3857),'20','16',0.8),
+(23,'0101000020E610000025FA13E595880BC022BB07131D024340'::geometry,ST_Transform('0101000020E610000025FA13E595880BC022BB07131D024340'::geometry, 3857),'23','01',0.1),
+(24,'0101000020E61000009C5F91C5095C17C0C78784B15A4F4540'::geometry,ST_Transform('0101000020E61000009C5F91C5095C17C0C78784B15A4F4540'::geometry, 3857),'24','07',0.3),
+(29,'0101000020E6100000C34D4A5B48E712C092E680892C684240'::geometry,ST_Transform('0101000020E6100000C34D4A5B48E712C092E680892C684240'::geometry, 3857),'29','01',0.3),
+(52,'0101000020E6100000406A545EB29A07C04E5F0BDA39A54140'::geometry,ST_Transform('0101000020E6100000406A545EB29A07C04E5F0BDA39A54140'::geometry, 3857),'52','19',0.01)
+-- Moral functions perform some nondeterministic computations
+-- (to estimate the significance); we will set the seeds for the RNGs
+-- that affect those results to have repeateble results
+SELECT cdb_crankshaft.cdb_random_seeds(1234);
+ cdb_random_seeds 
+------------------
+ 
+(1 row)
+
+SELECT ppoints.code, m.quads
+  FROM ppoints
+  JOIN cdb_crankshaft.cdb_moran_local('ppoints', 'value') m
+    ON ppoints.cartodb_id = m.ids
+  ORDER BY ppoints.code;
+NOTICE:  ** Constructing query
+CONTEXT:  PL/Python function "cdb_moran_local"
+NOTICE:  ** Query returned with 52 rows
+CONTEXT:  PL/Python function "cdb_moran_local"
+NOTICE:  ** Finished calculations
+CONTEXT:  PL/Python function "cdb_moran_local"
+ code |      quads      
+------+-----------------
+ 01   | HH
+ 02   | HL
+ 03   | Not significant
+ 04   | Not significant
+ 05   | Not significant
+ 06   | Not significant
+ 07   | Not significant
+ 08   | Not significant
+ 09   | Not significant
+ 10   | Not significant
+ 11   | LL
+ 12   | Not significant
+ 13   | Not significant
+ 14   | Not significant
+ 15   | Not significant
+ 16   | HH
+ 17   | Not significant
+ 18   | Not significant
+ 19   | Not significant
+ 20   | HH
+ 21   | LL
+ 22   | Not significant
+ 23   | Not significant
+ 24   | Not significant
+ 25   | HH
+ 26   | HH
+ 27   | Not significant
+ 28   | Not significant
+ 29   | LL
+ 30   | Not significant
+ 31   | HH
+ 32   | Not significant
+ 33   | Not significant
+ 34   | Not significant
+ 35   | LL
+ 36   | Not significant
+ 37   | Not significant
+ 38   | HL
+ 39   | Not significant
+ 40   | Not significant
+ 41   | HL
+ 42   | LH
+ 43   | Not significant
+ 44   | Not significant
+ 45   | LH
+ 46   | Not significant
+ 47   | Not significant
+ 48   | HH
+ 49   | Not significant
+ 50   | Not significant
+ 51   | LL
+ 52   | LL
+(52 rows)
+
diff --git a/pg/test/0.0.1/expected/02_poc_xyz_test.out b/pg/test/0.0.1/expected/02_poc_xyz_test.out
deleted file mode 100644
index 2af7619..0000000
--- a/pg/test/0.0.1/expected/02_poc_xyz_test.out
+++ /dev/null
@@ -1,8 +0,0 @@
-SELECT cdb_crankshaft.cdb_poc_xyz();
-NOTICE:  XYZ...
-CONTEXT:  PL/Python function "cdb_poc_xyz"
- cdb_poc_xyz 
--------------
- 83
-(1 row)
-
diff --git a/pg/test/0.0.1/results/02_poc_xyz_test.out b/pg/test/0.0.1/results/02_poc_xyz_test.out
deleted file mode 100644
index 2af7619..0000000
--- a/pg/test/0.0.1/results/02_poc_xyz_test.out
+++ /dev/null
@@ -1,8 +0,0 @@
-SELECT cdb_crankshaft.cdb_poc_xyz();
-NOTICE:  XYZ...
-CONTEXT:  PL/Python function "cdb_poc_xyz"
- cdb_poc_xyz 
--------------
- 83
-(1 row)
-
diff --git a/pg/test/0.0.1/sql/02_moran_test.sql b/pg/test/0.0.1/sql/02_moran_test.sql
new file mode 100644
index 0000000..9c32e3b
--- /dev/null
+++ b/pg/test/0.0.1/sql/02_moran_test.sql
@@ -0,0 +1,12 @@
+\i test/fixtures/ppoints.sql
+
+-- Moral functions perform some nondeterministic computations
+-- (to estimate the significance); we will set the seeds for the RNGs
+-- that affect those results to have repeateble results
+SELECT cdb_crankshaft.cdb_random_seeds(1234);
+
+SELECT ppoints.code, m.quads
+  FROM ppoints
+  JOIN cdb_crankshaft.cdb_moran_local('ppoints', 'value') m
+    ON ppoints.cartodb_id = m.ids
+  ORDER BY ppoints.code;
diff --git a/pg/test/0.0.1/sql/02_poc_xyz_test.sql b/pg/test/0.0.1/sql/02_poc_xyz_test.sql
deleted file mode 100644
index 62f7893..0000000
--- a/pg/test/0.0.1/sql/02_poc_xyz_test.sql
+++ /dev/null
@@ -1 +0,0 @@
-SELECT cdb_crankshaft.cdb_poc_xyz();
diff --git a/pg/test/fixtures/ppoints.sql b/pg/test/fixtures/ppoints.sql
new file mode 100644
index 0000000..10bc0c1
--- /dev/null
+++ b/pg/test/fixtures/ppoints.sql
@@ -0,0 +1,55 @@
+-- test table (spanish province centroids with some invented values)
+CREATE TABLE ppoints (cartodb_id integer, the_geom geometry, the_geom_webmercator geometry, code text, region_code text, value float);
+INSERT INTO ppoints VALUES
+( 1,'0101000020E6100000A8306DC0CBC305C051D14B6CE56A4540'::geometry,ST_Transform('0101000020E6100000A8306DC0CBC305C051D14B6CE56A4540'::geometry, 3857),'01','16',0.5),
+( 4,'0101000020E6100000E220A4362DC202C0FD8AFA5119994240'::geometry,ST_Transform('0101000020E6100000E220A4362DC202C0FD8AFA5119994240'::geometry, 3857),'04','01',0.1),
+( 5,'0101000020E610000004377E573AC813C0CB5871BB17494440'::geometry,ST_Transform('0101000020E610000004377E573AC813C0CB5871BB17494440'::geometry, 3857),'05','07',0.3),
+( 2,'0101000020E610000000F49BE19BAFFFBF639958FDA6694340'::geometry,ST_Transform('0101000020E610000000F49BE19BAFFFBF639958FDA6694340'::geometry, 3857),'02','08',0.7),
+( 3,'0101000020E61000005D0B7E63C832E2BFDB63EB00443D4340'::geometry,ST_Transform('0101000020E61000005D0B7E63C832E2BFDB63EB00443D4340'::geometry, 3857),'03','10',0.2),
+( 6,'0101000020E61000006F3742B7FB9018C0DD967DC4D95A4340'::geometry,ST_Transform('0101000020E61000006F3742B7FB9018C0DD967DC4D95A4340'::geometry, 3857),'06','11',0.05),
+( 7,'0101000020E6100000E4BB36995F4C0740EAC0E5CA9FC94340'::geometry,ST_Transform('0101000020E6100000E4BB36995F4C0740EAC0E5CA9FC94340'::geometry, 3857),'07','04',0.4),
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diff --git a/python/crankshaft/crankshaft/__init__.py b/python/crankshaft/crankshaft/__init__.py
index 9ae4eae..d07e330 100644
--- a/python/crankshaft/crankshaft/__init__.py
+++ b/python/crankshaft/crankshaft/__init__.py
@@ -1,2 +1,2 @@
-import poc
+import random_seeds
 import clustering
diff --git a/python/crankshaft/crankshaft/poc/__init__.py b/python/crankshaft/crankshaft/poc/__init__.py
deleted file mode 100644
index 90ac56c..0000000
--- a/python/crankshaft/crankshaft/poc/__init__.py
+++ /dev/null
@@ -1 +0,0 @@
-from xyz import *
diff --git a/python/crankshaft/crankshaft/poc/xyz.py b/python/crankshaft/crankshaft/poc/xyz.py
deleted file mode 100644
index 197f9db..0000000
--- a/python/crankshaft/crankshaft/poc/xyz.py
+++ /dev/null
@@ -1,6 +0,0 @@
-import plpy
-
-def xyz():
-    plpy.notice('XYZ...')
-    r = plpy.execute("select * from pg_class where relname='pg_class'")
-    return r[0]['reltype']
diff --git a/python/crankshaft/crankshaft/random_seeds.py b/python/crankshaft/crankshaft/random_seeds.py
new file mode 100644
index 0000000..b7c8eed
--- /dev/null
+++ b/python/crankshaft/crankshaft/random_seeds.py
@@ -0,0 +1,10 @@
+import random
+import numpy
+
+def set_random_seeds(value):
+    """
+    Set the seeds of the RNGs (Random Number Generators)
+    used internally.
+    """
+    random.seed(value)
+    numpy.random.seed(value)
diff --git a/python/crankshaft/setup.py b/python/crankshaft/setup.py
index c32f289..b863b27 100644
--- a/python/crankshaft/setup.py
+++ b/python/crankshaft/setup.py
@@ -22,7 +22,7 @@ setup(
     license='MIT',
 
     classifiers=[
-        'Development Status :: 1 - Planning',
+        'Development Status :: 3 - Alpha',
         'Intended Audience :: Mapping comunity',
         'Topic :: Maps :: Mapping Tools',
         'License :: OSI Approved :: MIT License',
@@ -38,6 +38,8 @@ setup(
         'test': ['unittest', 'nose', 'mock'],
     },
 
+    # The choice of component versions is dictated by what's
+    # provisioned in the production servers.
     install_requires=['pysal==1.11.0','numpy==1.6.1'],
 
     requires=['pysal', 'numpy'],
diff --git a/python/crankshaft/test/test_poc.py b/python/crankshaft/test/test_poc.py
deleted file mode 100644
index 06f08a3..0000000
--- a/python/crankshaft/test/test_poc.py
+++ /dev/null
@@ -1,23 +0,0 @@
-#!/usr/local/bin/python
-# -*- coding: utf-8 -*-
-
-import unittest
-
-# from mock_plpy import MockPlPy
-# plpy = MockPlPy()
-#
-# import sys
-# sys.modules['plpy'] = plpy
-
-from helper import plpy
-import crankshaft
-
-class TestPoc(unittest.TestCase):
-
-    def setUp(self):
-        plpy._reset()
-
-    def test_should_have_xyz(self):
-        plpy._define_result('select.*from\s+pg_class', [{'reltype': 111}])
-        assert crankshaft.poc.xyz() == 111
-        assert plpy.notices[0] == 'XYZ...'