diff --git a/.github/workflows/test.yaml b/.github/workflows/test.yaml
index b0cdcc8..20b9ef4 100644
--- a/.github/workflows/test.yaml
+++ b/.github/workflows/test.yaml
@@ -26,4 +26,5 @@ jobs:
 
       - name: Run tests
         run: |
+          # pixi run pytest -n auto -v src/mechdriver/tests/
           pixi run pytest -v src/mechdriver/tests/
diff --git a/.gitignore b/.gitignore
index 883d7cb..7076e33 100644
--- a/.gitignore
+++ b/.gitignore
@@ -117,3 +117,6 @@ __pycache__/
 # rattler-build output
 output/
 build/
+
+# Log files
+*.log
diff --git a/README.md b/README.md
index 58666d0..06d50ff 100644
--- a/README.md
+++ b/README.md
@@ -90,25 +90,79 @@ pixi run node csed-0001 out.log "g16 run.inp run.out"  	# run Gaussian
 
 ## Test
 
+Testing MechDriver is a two-step process. First, electronic structure calculations are
+run in parallel on a local cluster (requires SSH node access; currently not interfaced
+to a workload manager). Then, an end-to-end workflow is run with the filesystem database
+from step 1. This second step can be done locally and also runs on GitHub Actions.
+
 ### Step 1: Generate Electronic Structure Data
 
-The data generated here is compressed and stored in the MechDriver repository to be used
-on step 2.
+#### Run local tests
+
+Local tests can be run with the following command.
+```
+pixi run test local <node1> <node2> <...> &> test.log &
+```
+The nodes can be individually named or expanded as a Bash sequence, e.g.
+`csed-00{09..12}`.  The species/reaction-specific subtasks are parallelized across the
+given nodes for each task.  Unfortunately, this means that all jobs for a given task
+must complete before the workflow can move on to the next one.
+
+At the end of the run, the data from the local test run will be zipped into `.tgz`
+archive for use in GitHub Actions workflow testing (see below). This archive will
+include a `provenance.yaml` file recording the current commit hash of each repository.
+To make sure the latter is accurate, you will be prevented from running tests if you
+have uncommitted changes in one or more Python files.
+
+#### Check progress
+
+You can check the progress of a local test run as follows.
+```
+pixi run test status
 ```
-pixi run test setup       # create clean run directories
-pixi run test els <node>  # run data generation on a node, e.g. csed-0005
-pixi run test status      # check data generation progress
+This will display a table showing the status of your jobs and generate a set of
+`check_<test name>.log` files, containing the paths to any jobs that do not have an `OK`
+status (including running jobs), as well as the last line of the job log file.
+This file is designed to be easily grep-able:
+```
+grep "~conf_energy" check_quick.log       # See paths
+grep "~conf_energy" -A 1 check_quick.log  # See paths and last lines
 ```
 
-### Step 2: Run End-to-end Workflow with Existing Electronic Structure Data
+#### Signature required
 
-This step uses the data from step 1 to run an end-to-end workflow with the code.
+Once the local tests have completed, you **must** run the following command to "sign"
+the test run.
+Make sure your Git username is configured before you do this. [^4]
 ```
-pytest -v src/mechdriver/tests/
+pixi run test sign
 ```
-Although this works with old data, step 1 should be regularly re-run to catch any bugs
-related to electronic structure data generation.
-This is currently an honor system.
+This will create a `signature.yaml` file in the test directory containing your Git
+username and the commit hashes of each AutoMech module.
+
+To confirm that the tests are up to date, the GitHub Actions workflow checks that these
+commit hashes match the current ones on GitHub (excluding "Merge pull request" commits).
+Note that this means you will need to merge any changes to the lower-level modules
+**before** merging changes to MechDriver.
+
+#### What if I only made a small change?
+
+If you only made a small change, or made changes that you are confident will not affect
+the tested functionality, you can do the last step (signing) *without* re-running the
+local tests.
+This time, when you run `pixi run test sign`, you will be prompted to approve the
+additional commits to each module relative to the tested version.
+The record of these additional changes will be included in the `signature.yaml` file.
+
+
+### Step 2: End-to-end Workflow Test with Step 1 Data
+
+Once the local tests have been run, you can use the following command to run an
+end-to-end workflow test using the electronic structure data generated above.[^5]
+```
+pytest -n auto -v src/mechdriver/tests/
+```
+This is the same command that will be run on GitHub Actions.
 
 
 ## Contribute
@@ -252,3 +306,7 @@ gets out of sync, i.e.  `pixi run update upstream dev --force`.
 
 [^3]: This script simply runs `git status` in each repository.
 If you want to run a different command, you can pass it as an argument, i.e. `pixi run git branch -v` to see which branches are checked out.
+
+[^4]: The command to configure your git username is `git config --global user.name "<username>"`
+
+[^5]: The `-n auto` option runs these tests in parallel.
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-  subdir: linux-64
-  url: https://conda.anaconda.org/conda-forge/linux-64/pydantic-core-2.20.1-py310h42e942d_0.conda
-  sha256: 0645b2283b9fcc50d6f51891bc8c06f0db0ecb16beb177a4e42c98ae888e38d5
-  md5: 51dcc27558e8cbe3aa6d3641cd78aa6d
-  depends:
-  - __glibc >=2.17,<3.0.a0
-  - libgcc-ng >=12
-  - python >=3.10,<3.11.0a0
-  - python_abi 3.10.* *_cp310
-  - typing-extensions >=4.6.0,!=4.7.0
-  constrains:
-  - __glibc >=2.17
-  license: MIT
-  license_family: MIT
-  purls:
-  - pkg:pypi/pydantic-core?source=hash-mapping
-  size: 1602867
-  timestamp: 1720041574812
 - kind: conda
   name: pydantic-core
   version: 2.20.1
@@ -6142,9 +6135,9 @@ packages:
   sha256: 32cd6c042b5004b8e857d727708720c54a676d1e22917cf1a2df9b4d4868abd6
   requires_dist:
   - platformdirs>=2.2.0
-  - astroid<=3.3.0.dev0,>=3.2.2
-  - isort!=5.13.0,<6,>=4.2.5
-  - mccabe<0.8,>=0.6
+  - astroid>=3.2.2,<=3.3.0.dev0
+  - isort>=4.2.5,!=5.13.0,<6
+  - mccabe>=0.6,<0.8
   - tomlkit>=0.10.1
   - typing-extensions>=3.10.0 ; python_full_version < '3.10'
   - dill>=0.2 ; python_full_version < '3.11'
@@ -6245,7 +6238,7 @@ packages:
   requires_dist:
   - iniconfig
   - packaging
-  - pluggy<2.0,>=1.5
+  - pluggy>=1.5,<2.0
   - exceptiongroup>=1.0.0rc8 ; python_full_version < '3.11'
   - tomli>=1 ; python_full_version < '3.11'
   - colorama ; sys_platform == 'win32'
@@ -6258,6 +6251,18 @@ packages:
   - setuptools ; extra == 'dev'
   - xmlschema ; extra == 'dev'
   requires_python: '>=3.8'
+- kind: pypi
+  name: pytest-xdist
+  version: 3.6.1
+  url: https://files.pythonhosted.org/packages/6d/82/1d96bf03ee4c0fdc3c0cbe61470070e659ca78dc0086fb88b66c185e2449/pytest_xdist-3.6.1-py3-none-any.whl
+  sha256: 9ed4adfb68a016610848639bb7e02c9352d5d9f03d04809919e2dafc3be4cca7
+  requires_dist:
+  - execnet>=2.1
+  - pytest>=7.0.0
+  - psutil>=3.0 ; extra == 'psutil'
+  - setproctitle ; extra == 'setproctitle'
+  - filelock ; extra == 'testing'
+  requires_python: '>=3.8'
 - kind: conda
   name: python
   version: 3.10.14
@@ -6940,14 +6945,14 @@ packages:
 - kind: pypi
   name: ruff
   version: 0.5.0
-  url: https://files.pythonhosted.org/packages/28/9a/dde343d95ecd0747207e4e8d143c373ef961cbd6b78c61a659f67582dbd2/ruff-0.5.0.tar.gz
-  sha256: eb641b5873492cf9bd45bc9c5ae5320648218e04386a5f0c264ad6ccce8226a1
+  url: https://files.pythonhosted.org/packages/af/79/8a57016a761d11491b913460a3d1545cdbe96dca6acb1279102814c9147b/ruff-0.5.0-py3-none-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
+  sha256: 81e5facfc9f4a674c6a78c64d38becfbd5e4f739c31fcd9ce44c849f1fad9e4c
   requires_python: '>=3.7'
 - kind: pypi
   name: ruff
   version: 0.5.3
-  url: https://files.pythonhosted.org/packages/cd/2d/af3ed295223c7fbb5e9b465e1243dff0f901964dc3c7ee6093c76e2dee5f/ruff-0.5.3.tar.gz
-  sha256: 2a3eb4f1841771fa5b67a56be9c2d16fd3cc88e378bd86aaeaec2f7e6bcdd0a2
+  url: https://files.pythonhosted.org/packages/5f/d8/537923e6cb27c835b7991f0f0caeb85191aed744a0d808bc71ad598f9df2/ruff-0.5.3-py3-none-manylinux_2_17_x86_64.manylinux2014_x86_64.whl
+  sha256: 03bfe9ab5bdc0b08470c3b261643ad54ea86edc32b64d1e080892d7953add3ad
   requires_python: '>=3.7'
 - kind: conda
   name: scipy
@@ -7683,13 +7688,13 @@ packages:
   url: https://files.pythonhosted.org/packages/07/4d/410156100224c5e2f0011d435e477b57aed9576fc7fe137abcf14ec16e11/virtualenv-20.26.3-py3-none-any.whl
   sha256: 8cc4a31139e796e9a7de2cd5cf2489de1217193116a8fd42328f1bd65f434589
   requires_dist:
-  - distlib<1,>=0.3.7
-  - filelock<4,>=3.12.2
+  - distlib>=0.3.7,<1
+  - filelock>=3.12.2,<4
   - importlib-metadata>=6.6 ; python_full_version < '3.8'
-  - platformdirs<5,>=3.9.1
+  - platformdirs>=3.9.1,<5
   - furo>=2023.7.26 ; extra == 'docs'
   - proselint>=0.13 ; extra == 'docs'
-  - sphinx!=7.3,>=7.1.2 ; extra == 'docs'
+  - sphinx>=7.1.2,!=7.3 ; extra == 'docs'
   - sphinx-argparse>=0.4 ; extra == 'docs'
   - sphinxcontrib-towncrier>=0.2.1a0 ; extra == 'docs'
   - towncrier>=23.6 ; extra == 'docs'
diff --git a/pixi.toml b/pixi.toml
index cc9ad9b..6da2494 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -64,6 +64,7 @@ sphinx = "*"
 myst-parser = "*"
 sphinx-book-theme = "*"
 sphinx-autodoc-typehints = "*"
+pytest-xdist = { version = ">=3.6.1, <4", extras = ["psutil"] }
 
 [feature.build.dependencies]
 cmake = ">=3.30.0,<3.31"
diff --git a/scripts/test.py b/scripts/test.py
index 078166a..6bd346c 100644
--- a/scripts/test.py
+++ b/scripts/test.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python
 import os
 import shutil
+import socket
 import subprocess
 import tarfile
 import textwrap
@@ -68,7 +69,8 @@ def local(nodes: Sequence[str]):
 
     :param nodes: A comma-separted list of nodes
     """
-    assert len(TESTS) == 1, "Not yet ready for more than one test."
+    print("Process ID:", os.getpid())
+    print("Host name:", socket.gethostname())
 
     # 1. Record the current repository versions
     check_for_uncommited_python_changes(throw_error=True)