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+# ADR-009: Terminology consistency for "Material Allowance"
+
+## Status
+DRAFT
+
+## Context
+
+User's configuring a toolpath operation often want to fine tune how closely the cutter comes to the ideal model.  They may wish to leave behind a small amount of material that can be removed in a secondary operation (deburring, finishing, etc.).  They may also wish to overcut the model to compensate for inaccuracy in the model or tool chain.
+
+The FreeCAD CAM module uses inconsistent and confusing terminology for controls that cause the cutting tool to leave material behind. This ADR defines
+these terms and standardizes their usage across the module.
+
+Terms employed with the CNC/CAM community are not consistent and include:
+
+- Material Allowance
+- Stock to Leave
+- Stock Allowance
+- Stock Margin
+and others.
+
+## Decision
+
+Within the FreeCAD CAM module, we will use the term "Stock to Leave"
+
+### Modifiers
+
+In any context where the use of the term is ambiguous, we will use the modifier "axial" or "radial" to clarify the meaning.
+
+#### Axial
+Refers to material left behind when the cutter is end milling.  For example if the cutter is clearing a pocket with a 0.5mm axial stock to leave, it will leave 0.5mm of material at the bottom of the pocket.
+
+#### Radial
+Refers to material left behind when the cutter is side milling.  For example if the cutter is clearing a pocket with a 0.5mm radial stock to leave, it will leave 0.5mm of material on the walls of the pocket.
+
+## Consequences
+
+- Task panels, documentation, tooltips, and translation must be revisited for consistency.
+- Inconsistent operations and dressups must be updated to use the new terminology.  This may have backwards compatibility implications.