In haircutting, what are "guidelines" used for?

Guidelines in haircutting are crucial for determining length and shape. They serve as reference points that help stylists create uniformity and maintain control throughout the cutting process. By establishing a guideline—often a section of hair that is cut to a specific length—stylists can ensure that all subsequent sections are cut to the same length or in relation to that initial section, resulting in a cohesive and balanced haircut. This technique is vital for achieving various styles, as it directly influences the overall look and feel of the haircut.

The other choices focus on different aspects of hairdressing. While product applications and assessing hair texture are important in their own right, they do not play a role in the actual cutting process. Similarly, dividing sections evenly contributes to organization during a haircut but does not directly guide the length and shape like the guidelines do. Thus, the primary purpose of guidelines is rooted in establishing the foundational structure of the hairstyle.