Hair design and chemical-service decisions
Know the landmarks and the lines
Reference points guide consistent sectioning: the apex (highest point of the head), parietal ridge, occipital bone, four corners, and nape. Cutting lines are horizontal, vertical, or diagonal; sectioning follows those lines to keep lengths balanced. Distribution (how hair falls from the head) and projection/elevation (angle at which hair is held away from the head) together determine the shape.
Elevation is the whole exam
- 0 degrees - blunt, one-length, maximum weight at the perimeter.
- 45 degrees - graduated (stacked) shape, weight builds at the perimeter.
- 90 degrees - uniform layer, equal length throughout.
- 180 degrees - long layers, shortest at the top, longest at the perimeter.
Guides, tension, and checking
A stationary guide stays in one place and sections are brought to that fixed guide, which can create increasing lengths through overdirection. A traveling guide moves with each section (follows the previous cut). Notching creates texture and blends lines. Consistent tension matters: pulling some sections tighter than others creates uneven lines. Always cross-check by combing the hair into its natural fall and re-examining the line. Overdirection creates length increase or graduation toward the face.
Traps to expect
Questions often swap 90 and 180 degrees, or call graduated cutting "layered." Another trap: assuming a perimeter cutting angle alone guarantees a particular crown-volume result.
Worked example
A client wants fullness through the crown with tapered ends and blended length. Rule of thumb: volume at the top means shorter hair up top - a 90-degree uniform layer or 180-degree long layer, not a blunt 0-degree cut.
Connect the cut to the chemical-service plan
Consultation also records previous color, lightening, relaxer and permanent-wave history. A strand test evaluates a proposed product on a small hair section; it does not replace a manufacturer-directed skin allergy test. FDA advises following package directions and skin testing before hair dye, even when previous use was uneventful. A color-wheel decision identifies the unwanted tone before selecting its complement, but the wheel does not determine a universal developer strength. Permanent-wave neutralization and hydroxide-relaxer rinsing are different systems; follow the specific product instructions rather than interchanging chemicals. On damaged hair, revise or decline the service instead of attempting to repair uncertainty with stronger processing.