Process Improvement Plan for Espresso Beverage Delivery

Introduction

Wild Dog Coffee Company is a popular coffee shop that strives to provide high-quality beverages and exceptional customer service. To achieve this goal, it is important for the company to continuously monitor and improve its processes (Krajewski & Malhotra, 2022). This paper provides an analysis of beverage service time data for 50 beverage preparation events using the company's order processing system. It also presents a cause-and-effect diagram to identify potential sources of variation in the espresso beverage preparation process. Based on this analysis, the paper offers recommended quality and customer service improvements for the beverage preparation process. By implementing these recommendations and continuously monitoring their processes, Wild Dog Coffee Company can ensure high-quality beverages and exceptional customer service.

To prepare an espresso beverage, the first step is for the barista to grind the coffee beans to the appropriate size for espresso. The customer then places an order with the cashier or server, and the order is transmitted to the barista station, either manually or electronically. Once the order is received, the barista selects the appropriate cup size and espresso shot quantity. The espresso shots are extracted and poured into the cup. Steamed milk is then added, creating the desired beverage — such as a latte or cappuccino. Any additional ingredients or flavors are added per the customer's request. Finally, the completed beverage is handed to the customer either directly or via the server. The entire process is designed to ensure that the customer receives a high-quality espresso beverage that meets their individual taste preferences.

The espresso beverage preparation process aims to ensure that all espresso beverages are prepared to the same high standard, quickly and efficiently, in order to maximize customer satisfaction and maintain quality control.

1. Beverage Quality: A measure of the percentage of beverages that meet the company's quality standards. The target value is 95%. This metric will be measured through periodic quality checks conducted by the barista supervisor.

The Espresso Beverage Preparation Process

2. Order Accuracy: A measure of the percentage of orders that are correctly fulfilled. The target value is 99%. This metric will be measured through order audits conducted by the shift supervisor.

Step 1: Order is submitted

1.1 — The customer places an order with the cashier or server.
1.2 — The order is transmitted to the barista station via the order management system.
1.3 — The barista acknowledges receipt of the order.

Step 2: Beverage is prepared and handed to the customer

2.1 — The barista selects the appropriate cup size and espresso shot quantity for the order.
2.2 — The espresso shots are extracted and poured into the cup.
2.3 — Steamed milk is added to the cup, creating the desired beverage (latte, cappuccino, etc.).
2.4 — Any additional ingredients or flavors are added per the customer's request.
2.5 — The completed beverage is handed to the customer, either directly or via the server.
2.6 — The barista confirms that the order is complete in the order management system.

The high-level flow of the espresso preparation process proceeds as follows: Grind the beans → Tamp the grounds → Insert the portafilter → Place the cup below the group head → Start the shot → Time the extraction → Stop the shot → Remove the cup → Clean up. This sequence ensures a repeatable, quality-controlled extraction for every order.

Using the provided data for Wild Dog Coffee Company, it is possible to analyze the beverage service times to answer three key questions about the process.

To determine if the process is centered, the process mean can be calculated using the formula:

Process Mean = (sum of all values) / (number of values)

Process Mean = 88.28 / 50 = 1.77 minutes

Data Analysis and Statistical Control

The senior barista considers beverage delivery times between 2 and 3 minutes to be acceptable. Because the process mean of 1.77 minutes falls below this expected range, the process is not centered.

To determine if the process is capable at 3-sigma, the process capability index (Cpk) can be calculated using the formula:

Cpk = min((Process Mean − Lower Specification Limit) / (3 × Process Standard Deviation), (Upper Specification Limit − Process Mean) / (3 × Process Standard Deviation))

Assuming specification limits of 2 minutes (lower) and 3 minutes (upper), and a known process standard deviation of 0.5903 minutes:

Cpk = min((1.77 − 2) / (3 × 0.5903), (3 − 1.77) / (3 × 0.5903)) = min(−0.53, 0.93) = −0.53

Because the calculated Cpk is negative, the process is not capable at 3-sigma. A Cpk value below 1.0 indicates that the process does not consistently produce output within the specification limits.

To determine whether the process is in statistical control, an individual control chart can be constructed. The upper and lower control limits are calculated as follows:

UCL = Process Mean + 3 × (Process Standard Deviation / √n)
LCL = Process Mean − 3 × (Process Standard Deviation / √n)

With a process mean of 1.77 minutes, a standard deviation of 0.5903 minutes, and a sample size of 50:

UCL = 1.77 + 3 × (0.5903 / √50) = 2.21 minutes
LCL = 1.77 − 3 × (0.5903 / √50) = 1.33 minutes

When the individual values are plotted against these control limits, all 50 observations fall within the range, indicating that the process is in statistical control. This means that observed variation is attributable to common causes rather than special causes, but it does not mean the process is meeting its specification targets.

Conclusion

It is important for businesses to regularly analyze their processes to ensure quality and efficiency. Through a process of identifying sources of variation and implementing improvements, businesses can enhance their operations and provide better service to their customers. The use of statistical tools and process mapping techniques aids in this analysis and supports data-driven decision making. This process improvement plan provides Wild Dog Coffee Company with a clear path forward: by implementing the recommended changes and continuing to monitor their processes, the company can improve beverage quality and the overall customer experience.