diff --git a/rwx/err/__init__.py b/rwx/err/__init__.py
index 294d8d8..53a63c7 100644
--- a/rwx/err/__init__.py
+++ b/rwx/err/__init__.py
@@ -1,5 +1,7 @@
 """Handle errors."""
 
+from rwx import Class
 
-class Error(Exception):
+
+class Error(Class, Exception):
     """Parent class for all errors."""
diff --git a/rwx/os/pm/__init__.py b/rwx/os/pm/__init__.py
index d248e47..b3cacc4 100644
--- a/rwx/os/pm/__init__.py
+++ b/rwx/os/pm/__init__.py
@@ -2,10 +2,11 @@
 
 from abc import ABC, abstractmethod
 
+from rwx import Class
 from rwx.ps import Command
 
 
-class PM(ABC):
+class PM(Class, ABC):
     """Package Manager."""
 
     def __init__(self) -> None:
diff --git a/rwx/prj/__init__.py b/rwx/prj/__init__.py
index f4a8acb..3cba90b 100644
--- a/rwx/prj/__init__.py
+++ b/rwx/prj/__init__.py
@@ -2,8 +2,10 @@
 
 from pathlib import Path
 
+from rwx import Class
 
-class Project:
+
+class Project(Class):
     """Parent class for any type of project."""
 
     def __init__(self, file: Path) -> None:
@@ -13,10 +15,6 @@ class Project:
         self.root: Path = self.file.parent
         self.name: str = self.root.name
 
-    def __repr__(self) -> str:
-        """Represent project."""
-        return f"Project(file={self.raw!r})"
-
     def __str__(self) -> str:
         """Return file, root & name."""
         return f"""\
diff --git a/rwx/ps/__init__.py b/rwx/ps/__init__.py
index 54d58cf..601aca3 100644
--- a/rwx/ps/__init__.py
+++ b/rwx/ps/__init__.py
@@ -2,10 +2,10 @@
 
 import subprocess
 
-from rwx import txt
+from rwx import Class, txt
 
 
-class Command:
+class Command(Class):
     """Command to run."""
 
     def __init__(self, *arguments: str | tuple[str, ...]) -> None:
@@ -13,10 +13,6 @@ class Command:
         self.raw = arguments
         self.flat: list[str] = []
 
-    def __repr__(self) -> str:
-        """Represent command."""
-        return f"Command({self.raw!r})"
-
     def __str__(self) -> str:
         """Return raw & flat."""
         return f"""\