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+---
+tags:
+  - estimating
+---
+# Assemblies
+
+In [[construction-estimating-software]], 
+assemblies are groups of material items
+representing a specific scope of work.
+
+Assemblies reduce the effort required for takeoff
+by grouping related items,
+for example 3/4" EMT connectors and couplings
+in addition to conduit.
+
+Assemblies allow... (in order of necessity):
+
+1. complex items (devices, conduit runs, etc.) with known proportions to be counted as one.
+2. changes to be made to measures and counts without recounting an entire area.
+3. takeoffs to be skimmed for obvious deficiencies that would otherwise be obscured
+4. changes to be made to project requirements (specifications) without recounting an entire area.
+
+If we agree on the definition of `Branch Wiring: 2#12 #12G; 3/4"C, EMT; On Structure`
+and its contents as ratios of its length,
+then their quantities can be calculated with only one measurement.
+
+This is how "estimating software" assembly takeoff works,
+however its a simple generic process,
+possible with several tools an estimator should be familiar with:
+
+* `XLOOKUP()` - Excel
+* `Table.Join` - MS Power Query
+* `JOIN` - SQL
+
+## Abstraction
+
+An abstraction is a model that intentionally ignores details
+that are irrelevant to problem it is used to solve