lev-os TRIZ Segmentation (Principle #1)
Overview
Segmentation is the first of Genrich Altshuller's 40 Inventive Principles from TRIZ (Theory of Inventive Problem Solving), derived from analysis of over 200,000 patents. The principle states: divide an object into independent parts to increase its utility, adaptability, or to enable new functionalities impossible with the monolithic whole.
Segmentation appears in three forms:
- Physical Segmentation - Divide into physically independent pieces
- Modular Segmentation - Make easily assembled/disassembled
- Increased Degree of Segmentation - Take segmentation to the extreme (powder, liquid, gas)
The underlying insight: what cannot be achieved with a whole object often becomes possible when it is divided. Resistance, flexibility, customization, and maintenance all improve through strategic division.
When to Use
- A system is too rigid to adapt to varying conditions
- Transportation, storage, or handling of the whole is impractical
- Different parts need different properties or treatments
- You need customization without complete redesign
- Failure of one part shouldn't catastrophically affect the whole
- Assembly in confined spaces requires smaller components
- Different use cases require different configurations
The Process
Step 1: Identify the Constraint of Wholeness
What limitation exists because the object/system is currently monolithic?
Example: A full-length measuring pole cannot fit through doorways or car trunks.
Step 2: Determine the Segmentation Type
- Functional Segmentation: Divide by function (modular catheter with diagnostic + delivery sections)
- Spatial Segmentation: Divide by location (multi-layer packaging materials)
- Temporal Segmentation: Divide by time of use (sectional furniture deployed as needed)
- Granular Segmentation: Reduce to smallest useful unit (powder medication for precise dosing)
Step 3: Define Interface Points
Determine how segments will connect, interact, or combine. Design joints that are:
- Easy to assemble/disassemble
- Reliable under operational stress
- Compatible with varied configurations
Example: Hinged, spring-loaded measuring pole segments that snap back to vertical.
Step 4: Optimize Each Segment Independently
Each segment can now be optimized for its specific function without compromising others.
Example: Multi-layer packaging - inner layer for cushioning, middle for moisture barrier, outer for rigidity.
Step 5: Test Recombination Scenarios
Verify that segmented system meets requirements in all intended configurations.
Example Application
Situation (Medical Device Innovation): Traditional catheters are single rigid units causing patient discomfort during complex procedures.
Application:
- Constraint: Rigid catheter cannot navigate tortuous anatomy while maintaining diagnostic capability
- Type: Functional segmentation - separate diagnostic and delivery modules
- Interface: Quick-connect modular joints with fluid and electrical continuity
- Optimization: Diagnostic tip optimized for sensing; delivery section optimized for flexibility
- Result: Reduced patient discomfort by 40%, maintained diagnostic accuracy
Outcome: Modular catheter system enables mix-and-match configurations for different procedures, reducing inventory costs and improving outcomes.
Anti-Patterns
- Segmenting where wholeness is the primary value (a painting, a precision instrument requiring exact alignment)
- Creating too many segments that increase assembly complexity beyond the benefit
- Weak interface design that makes segments unreliable when combined
- Segmenting without considering how parts will be managed, stored, or replaced
- Ignoring emergent properties that only exist in the whole system
- Over-engineering segments when simple division would suffice
Related
- triz-taking-out (extract only the necessary part - more selective than full segmentation)
- triz-nested-doll (place segmented parts inside each other for compactness)
- first-principles-thinking (decompose to fundamentals before redesigning)
- domain-driven-design (segment software by bounded contexts)
- modular-architecture (software application of segmentation principle)