1.4 Key terms used in this book

Yield loss / Shrinkage: Weight or value loss of raw materials during processing (trimming loss) or cooking (cooking loss). Understanding yield loss is essential because it increases the true cost of the usable product.
True food cost: The actual cost of raw materials per unit after accounting for yield loss.
Contribution margin: The amount remaining from the selling price after deducting the direct food cost (COGS). This is the amount that "contributes" to paying fixed costs and generating profit.
Operating costs: All indirect or fixed costs required to keep the restaurant open, such as labor, rent, energy, and fixed fees.
Prime cost: The sum of total food costs and total labor costs. In a well-managed kitchen, the industry standard dictates that this ratio should generally not exceed 60–65% of total sales.
COGS (Cost of Goods Sold) / Food Cost: The direct cost of all raw materials used to produce a sold dish. A normal benchmark for food cost in the industry is typically around 28–35% of the selling price.
EBITDA (Earnings Before Interest, Taxes, Depreciation, and Amortization): Operating profit before calculating interest, taxes, depreciation, and amortization. This metric provides the clearest picture of core operational performance, as it excludes accounting factors like financing and taxes, allowing for accurate comparisons.

2. Psychology & Menu Management

Menu Engineering: A data-driven method where menu items are evaluated based on popularity (sales volume) and profitability (contribution margin). Dishes are categorized into Stars, Puzzles, Plow Horses, and Dogs to maximize overall profit.
Choice overload: A psychological condition guests experience when a menu contains too many options. Research shows that this increases decision time, causes stress, and often leads guests to choose cheaper, safer options. Guests spend an average of only 109 seconds scanning a menu before making a choice.
Suggestive selling & Upselling: Suggestive selling is recommending complementary additions to a meal, such as wine with a steak. Upselling encourages the guest to choose a more expensive or premium option, like upgrading to a premium gin. These are the most effective tools for increasing the average check without additional marketing costs.

3. Service Operations

Servuction model: A theoretical service process model that divides operations into a visible "Frontstage" (what the guest sees, like the dining room) and an invisible "Backstage" (kitchen and support systems). The model dictates that the backstage must run smoothly and efficiently for the frontstage to deliver excellent service.
Service Quality / SERVQUAL: A metric measuring how well service meets guest expectations. Research shows that high service quality—based on reliability, responsiveness, and professionalism—increases guest loyalty, extends their stay, and significantly raises their average spending.
Enlightened Hospitality: A business philosophy (pioneered by Danny Meyer) that prioritizes the staff above the guests. The core idea is that if a company treats its staff with deep care and respect, that happy and well-trained staff will naturally extend genuine hospitality to the customers, building strong loyalty.

4. Internal Control & Safety (Inventory & HACCP)

Segregation of duties: A fundamental management rule in internal control designed to prevent fraud and theft. It requires that the same employee should never handle an entire product flow alone; for example, the person ordering goods should not be the same person receiving and verifying them.
FIFO (First In, First Out): The golden rule in inventory management and food safety. It ensures that the oldest products are always placed at the front of the shelf so they are used before they spoil.
Inventory turnover: A key metric showing how often the inventory is depleted and restocked over a given period. A high turnover rate indicates efficiency, ensures ingredient freshness, and prevents capital from being unnecessarily tied up in storage.
HACCP (Hazard Analysis and Critical Control Points): A mandatory, internationally recognized food safety and quality management system based on prevention. It involves mapping critical control points (CCPs) such as cooking temperatures to mitigate biological, chemical, or physical risks.
SOP (Standard Operating Procedure): Written, step-by-step procedures ensuring tasks are consistently performed to the exact same standard, regardless of who is on shift. This minimizes errors and simplifies the training of new staff.