Manufacturing Newsletter — Understanding the 7 Wastes (TIMWOOD) in Simple Terms

A quick reminder of why this matters

Every factory wants to run smoothly, avoid delays, and keep costs under control. But most of the problems that slow us down come from waste — activities that take time and effort but don’t add any value for the customer. Lean manufacturing uses the acronym TIMWOOD to help everyone remember the seven types of waste that appear in almost every workplace.

What TIMWOOD Stands For

TIMWOOD is a simple memory tool used across manufacturing:

T – Transportation
I – Inventory
M – Motion
W – Waiting
O – Overproduction
O – Overprocessing
D – Defects

Each one creates delays, extra cost, and frustration — but once you know what to look for, they become much easier to spot and fix.

The 7 Wastes Explained in Plain English

T – Transportation: Moving things more than needed

Transportation waste happens when materials, parts, or tools travel too far or too often.

Example, what it looks like: Pallets moved multiple times, forklifts travelling long distances, parts stored far from where they’re used.
Why it’s waste: It adds time, increases handling risks, and slows down production.

I – Inventory: Having more stock than you need

Inventory waste is when you hold more materials, WIP, or finished goods than the process requires.

Example, what it looks like: Shelves full of unused parts, large batches waiting for the next step, stock that gathers dust.
Why it’s waste: It ties up money, takes up space, and hides problems like defects or delays.

M – Motion: Extra movement by people

Motion waste is unnecessary walking, bending, reaching, or searching.

Example, what it looks like: Operators walking across the shop floor to find tools, bending awkwardly, or stretching to reach items.
Why it’s waste: It slows the job down, increases fatigue, and can lead to injuries.

W – Waiting: When people or machines are stuck doing nothing

Waiting waste is downtime between steps in the process.

Example, what it looks like: Machines idle because materials haven’t arrived, operators waiting for instructions, batches sitting untouched.
Why it’s waste: It stops the flow, creates delays, and often leads to overtime.

O – Overproduction — Making more than needed

Overproduction is creating items before they’re required or making too many.

Example, what it looks like: Running big batches “just in case,” producing ahead of schedule, filling shelves with finished goods no one has ordered.
Why it’s waste: It creates extra inventory, hides quality issues, and increases storage costs.

O – Overprocessing: Doing more work than necessary

Overprocessing is adding steps the customer doesn’t care about.

Example, what it looks like: Double-checking something that only needs one check, polishing beyond requirement, using complex machines for simple tasks.
Why it‘s waste: It wastes time, adds cost, and doesn’t improve the final product

D – Defects: Mistakes that need rework or scrap

Defects are anything that isn’t right the first time.

Example, what it looks like: Parts failing inspection, incorrect paperwork, missing information, rework, scrap.
Why it’s waste: It costs time, money, and customer trust — and often points to deeper issues like unclear instructions or inconsistent processes.

Why TIMWOOD Waste Becomes “Normal”

Waste often becomes part of everyday work without anyone noticing. Common reasons include:

“We’ve always done it this way.”
Layouts that were never updated.
Tools stored in the wrong place.
Procedures that don’t match how the job is actually done.
Poor communication between teams.

Once waste becomes routine, it blends into the background — and that’s when it becomes expensive.

Simple Ways to Reduce TIMWOOD Waste

A few practical habits make a big difference:

Organise work areas (5S) so tools and materials are easy to find.
Keep items close to where they’re used to reduce walking and searching.
Use clear, simple instructions so everyone works the same way.
Talk across teams so planning, production, and quality stay aligned.
Fix small problems quickly before they grow into bigger ones.
Review layouts and processes regularly instead of letting them drift.

Small improvements add up to major gains.

A Simple Real-World Example

In one factory, operators walked several minutes each shift to get a shared tool.
By adding a tool board at each station:

Walking time disappeared
Jobs were finished faster
Operators were less tired
Quality improved

This single change reduced Motion, Waiting, and Overprocessing all at once — and that’s the power of TIMWOOD.

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