diff --git a/.gitignore b/.gitignore
index a0b1ec8..aba0860 100644
--- a/.gitignore
+++ b/.gitignore
@@ -118,3 +118,4 @@ outputs/
 src/
 dev_scripts/
 .claude/
+CLAUDE.md
diff --git a/openquake/hme/utils/io/source_processing.py b/openquake/hme/utils/io/source_processing.py
index f474dfe..b0bce09 100644
--- a/openquake/hme/utils/io/source_processing.py
+++ b/openquake/hme/utils/io/source_processing.py
@@ -195,6 +195,7 @@ def _process_source_chunk(source_chunk_w_args) -> list:
 
     rups = flatten_list(rups)
 
+    pbar.close()
     return rups
 
 
@@ -446,7 +447,13 @@ def rupture_dict_to_gdf(
     dfs = []
 
     for branch, branch_df in rupture_dict.items():
-        branch_df["occurrence_rate"] *= weights[branch]
+        branch_df = branch_df.copy()
+        w = weights[branch]
+        if isinstance(w, dict):
+            src_ids = branch_df.index.str.rsplit("_", n=1).str[0]
+            branch_df["occurrence_rate"] *= src_ids.map(w)
+        else:
+            branch_df["occurrence_rate"] *= w
         branch_df.index = branch_df.index.values + f"_{branch}"
         branch_df["branch"] = branch
 
diff --git a/openquake/hme/utils/io/source_reader.py b/openquake/hme/utils/io/source_reader.py
index 9330d6c..3ce371e 100644
--- a/openquake/hme/utils/io/source_reader.py
+++ b/openquake/hme/utils/io/source_reader.py
@@ -11,15 +11,18 @@
 from openquake.engine.engine import create_jobs, run_jobs
 
 from openquake.hazardlib.gsim_lt import GsimLogicTree
+from openquake.hazardlib.source import MultiPointSource
 
 from openquake.hme.utils.utils import _get_class_name, breakpoint
 
 try:
     from openquake.hazardlib.source_group import read_csm
+
     csm_new_flag = True
 except ImportError:
     csm_new_flag = False
 
+
 def csm_from_job_ini(job_ini, get_gsim_lt: bool = False):
     if not isinstance(job_ini, dict) and os.path.isfile(job_ini):
         job_ini = get_params(job_ini)
@@ -43,7 +46,7 @@ def csm_from_job_ini(job_ini, get_gsim_lt: bool = False):
     with job, datastore.read(job.calc_id) as dstore:
         if csm_new_flag:
             csm = read_csm(dstore)
-        else: # older OQ
+        else:  # older OQ
             csm = dstore['_csm']
         sources = csm.get_sources()
         logging.debug("\tgot csm from dstore")
@@ -145,7 +148,7 @@ def process_source_logic_tree_oq(
     gmm_lt_file: str = "gmmLT.xml",
     sites_file: Optional[str] = None,
     branch: Optional[str] = None,
-    collapse_lt: Optional[bool] = False,
+    collapse_lt: Optional[bool] = True,
     source_types: Optional[Sequence] = None,
     tectonic_region_types: Optional[Sequence] = None,
     description: Optional[str] = None,
@@ -218,19 +221,17 @@ def process_source_logic_tree_oq(
                     s.num_ruptures for s in ssm_lt_sources["composite"]
                 ]
             }
-            source_weights = list(sources_w_weights.values())
-            ssm_lt_weights = {"composite": []}
-
-            for i, rup_count in enumerate(ssm_lt_rup_counts["composite"]):
-                ssm_lt_weights["composite"].append(
-                    np.ones(rup_count) * source_weights[i]
-                )
-
-            ssm_lt_weights["composite"] = np.hstack(
-                ssm_lt_weights["composite"]
-            )
+            src_weight_dict = {}
+            for src, w in sources_w_weights.items():
+                if isinstance(src, MultiPointSource):
+                    for sub_src in src:
+                        src_weight_dict[sub_src.source_id] = w
+                else:
+                    src_weight_dict[src.source_id] = w
+
+            ssm_lt_weights = {"composite": src_weight_dict}
             logging.info(
-                f"{len(ssm_lt_weights['composite']):_} rups in composite model"
+                f"{len(ssm_lt_weights['composite']):_} sources in composite model"
             )
         else:
             ssm_lt_sources = branch_sources
diff --git a/openquake/hme/utils/io/tests/test_io.py b/openquake/hme/utils/io/tests/test_io.py
index 8e3aed2..a4bd3d7 100644
--- a/openquake/hme/utils/io/tests/test_io.py
+++ b/openquake/hme/utils/io/tests/test_io.py
@@ -1,13 +1,30 @@
+import os
+import pathlib
 import unittest
 
+
 import numpy as np
 import pandas as pd
 
+from openquake.hme.core.core import read_yaml_config
 from openquake.hme.utils.io import read_rupture_file
 from openquake.hme.utils.simple_rupture import SimpleRupture
 
 from openquake.hme.utils.tests.load_sm1 import cfg, input_data, eq_gdf, rup_gdf
 
+from openquake.hme.utils.io.source_reader import (
+    process_source_logic_tree_oq,
+)
+
+from openquake.hme.utils.io.source_processing import (
+    rupture_dict_from_logic_tree_dict,
+    rupture_dict_to_gdf,
+)
+
+from openquake.hme.utils.utils import breakpoint
+
+BASE_PATH = pathlib.Path(os.path.dirname(__file__))
+
 
 def test_read_rupture_file():
     rup_fp = cfg["input"]["rupture_file"]["rupture_file_path"]
@@ -24,4 +41,58 @@ def test_read_rupture_file():
                 if isinstance(param_r1, str):
                     assert param_r1 == param_r2
                 else:
-                    np.testing.assert_almost_equal(param_r1, param_r2, decimal=2)
+                    np.testing.assert_almost_equal(
+                        param_r1, param_r2, decimal=2
+                    )
+
+
+def test_2_branches():
+    test_dir = (
+        BASE_PATH
+        / '..'
+        / '..'
+        / 'tests'
+        / 'data'
+        / 'source_models'
+        / '2_branches'
+    )
+    cfg = read_yaml_config(test_dir / 'test_2_ssm_branches.yaml')
+    source_cfg = cfg['input']['ssm']
+    (
+        b_ssm_lt_sources,
+        b_ssm_lt_weights,
+        b_ssm_lt_rup_counts,
+        b_gsim_lt,
+    ) = process_source_logic_tree_oq(
+        source_cfg["job_ini_file"],
+        test_dir / source_cfg["ssm_dir"],
+    )
+
+    (
+        c_ssm_lt_sources,
+        c_ssm_lt_weights,
+        c_ssm_lt_rup_counts,
+        c_gsim_lt,
+    ) = process_source_logic_tree_oq(
+        source_cfg["job_ini_file"],
+        test_dir / source_cfg["ssm_dir"],
+        collapse_lt=True,
+    )
+
+    branch_rdf = rupture_dict_to_gdf(
+        rupture_dict_from_logic_tree_dict(
+            b_ssm_lt_sources,
+            b_ssm_lt_rup_counts,
+        ),
+        b_ssm_lt_weights,
+    )
+
+    collapse_rdf = rupture_dict_to_gdf(
+        rupture_dict_from_logic_tree_dict(
+            c_ssm_lt_sources,
+            c_ssm_lt_rup_counts,
+        ),
+        c_ssm_lt_weights,
+    )
+
+    breakpoint()
diff --git a/openquake/hme/utils/io/tests/test_source_reader.py b/openquake/hme/utils/io/tests/test_source_reader.py
index 18dbda0..4fbb628 100644
--- a/openquake/hme/utils/io/tests/test_source_reader.py
+++ b/openquake/hme/utils/io/tests/test_source_reader.py
@@ -6,6 +6,7 @@
 
 from openquake.hme.core.core import read_yaml_config
 from openquake.hme.utils.tests import load_sm1
+from openquake.hme.utils.utils import breakpoint
 from openquake.hme.utils.io.source_reader import (
     csm_from_job_ini,
     # get_csm_rlzs,
@@ -19,8 +20,6 @@
 BASE_PATH = pathlib.Path(os.path.dirname(__file__))
 
 
-source_cfg = load_sm1.cfg["input"]["ssm"]
-
 # w/ job ini
 # get job ini
 # get csm
@@ -32,6 +31,8 @@
 
 
 def test_single_branch_without_job_ini():
+    source_cfg = load_sm1.cfg["input"]["ssm"]
+
     def test_make_job_ini():
         job_ini = make_job_ini(
             source_cfg["ssm_dir"],
@@ -98,6 +99,7 @@ def test_csm_from_job_ini():
 
 
 def test_process_source_logic_tree_oq():
+    source_cfg = load_sm1.cfg["input"]["ssm"]
     (
         ssm_lt_sources,
         ssm_lt_weights,
@@ -119,11 +121,18 @@ def test_process_source_logic_tree_oq():
 
     assert list(ssm_lt_weights.keys()) == [0]
     assert ssm_lt_weights == {0: 1.0}
-    
+
 
 def test_2_branches_compound():
-    test_dir = (BASE_PATH / '..' / '..' / 'tests' / 'data' / 'source_models' / 
-                '2_branches')
+    test_dir = (
+        BASE_PATH
+        / '..'
+        / '..'
+        / 'tests'
+        / 'data'
+        / 'source_models'
+        / '2_branches'
+    )
     cfg = read_yaml_config(test_dir / 'test_2_ssm_branches.yaml')
     source_cfg = cfg['input']['ssm']
     (
@@ -134,24 +143,55 @@ def test_2_branches_compound():
     ) = process_source_logic_tree_oq(
         source_cfg["job_ini_file"],
         test_dir / source_cfg["ssm_dir"],
-        )
+    )
 
-    assert tuple(ssm_lt_sources.keys()) == (0,1)
+    assert tuple(ssm_lt_sources.keys()) == (0, 1)
     assert len(ssm_lt_sources[0]) == 2
     assert ssm_lt_sources[0][0].__class__.__name__ == 'PointSource'
 
     assert ssm_lt_weights == {0: 0.75, 1: 0.25}
     assert ssm_lt_rup_counts == {0: [1, 1], 1: [1, 1]}
     # no need to test gsim_lt
+    # breakpoint()
 
-@unittest.skip("not implemented correctly")
+
+# @unittest.skip("not implemented correctly")
 def test_2_branches_collapse():
-    pass
+    test_dir = (
+        BASE_PATH
+        / '..'
+        / '..'
+        / 'tests'
+        / 'data'
+        / 'source_models'
+        / '2_branches'
+    )
+    cfg = read_yaml_config(test_dir / 'test_2_ssm_branches.yaml')
+    source_cfg = cfg['input']['ssm']
+    (
+        ssm_lt_sources,
+        ssm_lt_weights,
+        ssm_lt_rup_counts,
+        gsim_lt,
+    ) = process_source_logic_tree_oq(
+        source_cfg["job_ini_file"],
+        test_dir / source_cfg["ssm_dir"],
+        collapse_lt=True,
+    )
+
+    # breakpoint()
 
 
 def test_2_branches_1_branch():
-    test_dir = (BASE_PATH / '..' / '..' / 'tests' / 'data' / 'source_models' / 
-                '2_branches')
+    test_dir = (
+        BASE_PATH
+        / '..'
+        / '..'
+        / 'tests'
+        / 'data'
+        / 'source_models'
+        / '2_branches'
+    )
     cfg = read_yaml_config(test_dir / 'test_2_ssm_branches.yaml')
     source_cfg = cfg['input']['ssm']
     source_cfg['branch'] = 1
@@ -164,9 +204,9 @@ def test_2_branches_1_branch():
         source_cfg["job_ini_file"],
         test_dir / source_cfg["ssm_dir"],
         branch=source_cfg['branch'],
-        )
+    )
 
     assert tuple(ssm_lt_sources.keys()) == (1,)
     assert len(ssm_lt_sources[1]) == 2
     assert ssm_lt_weights == {1: 1.0}
-    assert ssm_lt_rup_counts == {1: [1,1]}
+    assert ssm_lt_rup_counts == {1: [1, 1]}