Graduation and Bob Cutting With Scissors

Graduation is a way of cutting where each section ends up slightly shorter than the one below it, which builds weight into a rounded, stacked edge. Most bobs are made from graduation, a one-length base, or a mix of both. Once you can name the structure, the bob becomes a plan instead of a guess.

What are the four base structures?

They’re one-length, graduation, layering and uniform layering. Different training systems give them different names, so go by the lift angle rather than the word.

Structure	Lift angle	What it does
One-length	0 degrees	All the hair falls to one line, so the edge is heavy
Graduation	About 15 to 60 degrees	Close-set steps, weight at the edge
Layering	About 45 to 90 degrees and above	Wide steps, movement through the inside
Uniform layering	90 degrees	Every section follows the shape of the skull

Weight follows elevation. For a heavy, clean edge, keep the angle low. For a lighter, moving shape, raise it. Our elevation and over-direction guide explains the two angles with a diagram.

How does graduation work?

You direct the hair downwards and cut each panel slightly shorter than the one beneath it, working up the head in partings. The result is fine, close steps that stack into a rounded shape. That roundness is what makes a graduated bob look full at the back.

Graduation is often described in three rough ranges. Educators draw the lines a little differently, so treat the numbers as a guide:

• Low (about 15 to 30 degrees): subtle stacking at the nape, a soft bob.
• Medium (about 45 degrees): the angle most courses teach first.
• High (about 60 to 75 degrees): dramatic stacking that starts to look like layers.

It also helps when the back of the head is flat and you want to build shape there.

What goes wrong, and how do you check it?

The most common fault is unintended over-direction. You pull sections a little forward or back, the line looks fine under tension, then it collapses into unevenness when the hair falls. Let each section drop naturally first, then lift it to your angle.

To check, work at right angles to your cutting. After cutting horizontal graduation, part vertically. A clean short-to-long diagonal means your angle held. Bumps or flat spots show where it drifted. Our cross-checking guide walks through the check step by step, and plan and check a haircut covers the consultation before it.

How do the bob variations come together?

Most bobs sit somewhere between the cheekbone and the collarbone. What changes is how you combine elevation, graduation and your cutting line at the hem. Names vary between teachers, so check what your trainer means by each one.

Bob	How it’s built
Classic bob	One-length with a blunt edge
A-line bob	Shorter at the back, longer to the front, no stacking
Inverted or graduated bob	Stacked graduation at the nape, with volume at the back
Stacked bob	Layered stacking for the most volume at the back of the head
Asymmetrical bob	One side deliberately longer
Lob	Collarbone length

A sloped perimeter such as an A-line is set with over-direction at low elevation. The direction you pull decides which side keeps the length.

Where do blunt cutting and one-length fit?

Blunt cutting is the action. One-length is the structure it often builds. You cut a section straight across to make a clear, continuous line, and with no lift and a steady guide you get a heavy, solid edge.

Blunt doesn’t mean horizontal, and it doesn’t mean wet only. Your line can be diagonal or curved, and many stylists work blunt on wet or dry hair. If the hair pushes or folds as you cut, stop and check the section, your tension, your blade position and the scissors, in that order. Our blunt cutting guide covers the method.

What is undercutting?

Undercutting means cutting the underneath layers much shorter while the top stays long, so the short work hides beneath the overlay. It takes out weight you can’t see without changing the visible length, which suits thick hair that lies like a block. It sits naturally with bob work, particularly disconnected bobs, where the break between lengths is deliberate.

Common questions

What is the difference between graduation and layering?

Graduation builds weight at the edge, with shorter lengths underneath. Layering moves weight into the inside, with shorter lengths on top. See how to cut layers.

Can I do a bob without graduation?

Yes. A classic bob is one-length with a blunt edge, and an A-line bob has no stacking.

What angle do I use for a graduated bob?

Medium graduation sits around 45 degrees. Lower angles give a softer stack and higher angles give a stronger one.

Do I need special scissors?

No. Choose blade reach, tip access and handle fit for the section you’re cutting, and check the result in the state the client will wear it. Which scissors for which haircut goes through bobs and graduation.

Next step

New to the angles? Start with elevation and over-direction, then practise one structure at a time on a mannequin. The apprentice cutting checklist gives you a page to log each attempt.