Selection of a chemical compound applicable on a class of human hairs

A computer-implemented method for selecting a chemical compound applicable on a class of human hairs, the class of human hairs being constrained by hair properties, the method comprising:

• obtaining (S10) a database storing data relative to chemical compounds applicable on the class of human hairs, for each compound the data comprising:
• an identifier,
• an ingredient, and
• a performance score of the chemical compound when applied on human hairs, the performance score comprising a manageability score and a goal score;
• obtaining (S20), from user input, assessed hair properties and hair target properties;
• computing (S30) at least one goal score and a manageability goal score from the assessed hair properties and hair target properties, the computed goal score and the computed manageability goal score thereby forming a signature;
• determining (S40) at least one identifier of a chemical compound stored in the database corresponding to a chemical compound satisfying the computed goal score and the computed manageability goal score, the satisfying comprising minimizing a distance function between the computed goal score and a corresponding goal score and maximizing a fit-to-manageability function between the computed manageability goal score and the corresponding manageability score;
• outputting (S50) the determined at least one identifier of the chemical compound to be applied on the human hairs;
• selecting the chemical compound of the at least one identifier;
• applying the selected chemical compound to the human hair to provide the hair target properties;
• wherein
• the assessed hair properties and/or hair target properties comprise one or more of a hair type criterion including straight hair, wavy hair, curly hair or coily hair, a hair length criterion of short, medium or long, a hair condition criterion including untreated, colored, permed or bleached hair, a hair feel criterion associated with virgin hair or with chemically or heat treated hair, hair tool use criterion, a hair goal criterion including color protection, repair, shine, smooth, a scalp condition criterion including oily, dandruff, dry, a scalp goal criterion including sebum control, anti-dandruff and moisturize, a hair texture criterion, a hair diameter criterion including fine, medium and coarse, degree of damage criterion and/or a hair diameter of fine hair of 50 to 70 mm diameter, medium hair of 70 to 90 mm diameter and coarse hair of 90 to 120 mm diameter;
• and
• the selected chemical compound applicable to human hairs comprise one or more of a shampoo compound and/or a hair conditioner compound;
• and,
• wherein the distance function for the shampoo compound and/or the hair conditioner compound is determined according to:
• a shampoo compound distance term of the type:
• (
• Cleansing
• ⁢
• Score
• ⁢
• Product
• -
• Cleansing
• ⁢
• Score
• ⁢
• target
• )
• 2
• +
• (
• Shampoo
• ⁢
• Manageability
• ⁢
• Product
• -
• Shampoo
• ⁢
• Manageability
• ⁢
• Score
• ⁢
• target
• )
• 2
• ;
• a conditioner compound distance term of the type:
• Conditioner Manageability Product-Conditioner Score target;
• or
• a treatment distance term of the type:
• Treatment Manageability Product-Treatment Score target;
• wherein:
• Cleansing Score Product, is a variable representing a value of a cleansing goal score by the chemical compound;
• Shampoo Manageability Product is a variable representing a value of a goal score of a shampooing manageability by the chemical compound;
• Treatment Manageability Product is a variable representing a value of a goal score of a treatment manageability by the chemical compound;
• Cleansing Score Target is a variable representing a value of a cleansing goal score computed from the assessed hair properties;
• Treatment Score Target is a variable representing a value of a treatment goal score computed from the assessed hair properties and hair target properties;
• Shampoo Manageability Score Target is a variable representing a value of a shampoo manageability goal score computed from the assessed hair properties and hair target properties;
• and
• Conditioner Manageability product is a variable representing a value of a conditioner manageability goal score computed from the assessed hair properties and hair target properties.