# Four Inventory Models That Will Boost Your Operations Management and Procurement

Are you looking for ways to improve your operations management and procurement processes? One effective way is by implementing the right inventory models. Inventory models are mathematical formulas that help businesses determine when and how much stock to order, ultimately improving their supply chain efficiency. In this blog post, we’ll discuss four popular inventory models that can boost your operations management strategies and streamline your procurement process. Whether you’re a small business owner or a large corporation, these inventory models can help optimize your inventory levels while saving time and money. So without further ado, let’s dive into the world of inventory management!

## The Four Inventory Models

The Four Inventory Models are mathematical formulas that help businesses determine the optimal stock levels they need to maintain in order to meet customer demand while minimizing costs.

The Fixed-Order Quantity Model is one of the most commonly used inventory models. This model sets a specific amount of stock to be ordered each time it reaches a predetermined reorder point.

On the other hand, The Fixed-Time Period Model orders inventory at regular intervals regardless of current inventory levels. This model ensures that there is always enough stock on hand without overstocking.

Another popular model is The Periodic Review Model which involves reviewing and ordering new inventory at set intervals. Unlike the fixed-time period model, this approach allows for more flexibility as stock can be ordered based on actual demand rather than just at set intervals.

We have The Continuous Review Model which continuously monitors and tracks inventory levels and automatically reorders when reaching a predefined reorder point. This reduces the risk of running out of stock and increases efficiency by eliminating manual intervention in procurement decisions.

Understanding these four models can help you make better procurement decisions by optimizing your supply chain’s performance while reducing costs associated with excess or inadequate inventories.

## The First Inventory Model: The Fixed-Order Quantity Model

The Fixed-Order Quantity Model is a popular inventory model that helps businesses keep track of their inventory levels. Under this model, the business places orders for a fixed quantity of items whenever the inventory level drops below a certain point. This point is known as the reorder point.

The primary advantage of using this model is that it ensures that you always have enough stock to meet customer demand without having too much excess inventory on hand. This can save your business money by reducing storage costs and minimizing waste.

Another benefit of using the Fixed-Order Quantity Model is that it allows businesses to take advantage of volume discounts offered by suppliers. By ordering in larger quantities less frequently, you may be able to negotiate lower prices per unit from your suppliers.

However, one potential downside to this model is the risk of stockouts if unexpected changes in demand occur or lead times are longer than anticipated. To mitigate these risks, businesses should regularly review their reorder points and safety stock levels to ensure they are appropriately set based on historical data and market trends.

## The Second Inventory Model: The Fixed-Time Period Model

The Fixed-Time Period Model is another inventory model that can help boost operations management and procurement. This model is also known as the periodic review system, and it involves ordering a specific quantity of items at predetermined intervals.

The intervals are usually fixed time periods, such as weekly or monthly, hence the name “fixed-time period” model. During each interval, the inventory level is checked, and an order is placed to bring it back up to a predetermined level.

One advantage of this model is that it allows for better coordination between different departments within a company. For example, if there are several locations that need to maintain similar inventory levels, they can all use the same fixed-time period cycle.

However, one potential disadvantage of this model is that unexpected changes in demand may not be accounted for until the next interval. This means there may be times when too much or too little inventory exists because adjustments cannot be made until the next predefined interval arrives.

Though, The Fixed-Time Period Model represents another useful tool in managing your inventory effectively while minimizing potential supply chain disruptions.

## The Third Inventory Model: The Periodic Review Model

The Periodic Review Model is another inventory model that can help boost your operations management and procurement. This method involves reviewing inventory levels at fixed intervals, rather than continuously or on a set schedule like the Fixed-Time Period Model.

With this approach, you’ll determine the average demand during each review period and order enough stock to cover that amount until the next review. The goal is to ensure you have enough inventory on hand to meet customer demand while avoiding excess stockpiling.

One advantage of this model is that it allows for flexibility in ordering quantities since they’re not tied to specific time frames. However, it does require careful analysis of demand patterns and lead times to ensure adequate supply between reviews.

## The Fourth Inventory Model: The Continuous Review Model

The Continuous Review Model is an inventory model that keeps track of the inventory levels continuously. It seeks to ensure that a company never runs out of stock while reducing holding costs.
This model uses a reorder point, which is the predetermined level at which new inventory should be ordered.
When the quantity in stock reaches this point, an order for more items is triggered automatically. This ensures that there are always enough products on hand to meet customer demand.
The continuous review model provides real-time information about inventory and helps businesses make informed decisions about when to reorder and how much to order.
However, this model requires constant monitoring of inventory levels and can be challenging for companies with vast product lines or fluctuating demand patterns.
Implementing the continuous review model can help organizations optimize their procurement processes and improve operations management by ensuring they have adequate stock levels without overstocking.

## Conclusion

Managing inventory is crucial for efficient operations management and procurement. Implementing the right inventory model can help businesses reduce costs, improve customer satisfaction and increase profits. Each of the four models discussed – fixed-order quantity, fixed-time period, periodic review, and continuous review – offers unique benefits that can be tailored to specific business needs.

It’s important to note that choosing an inventory model requires careful consideration of factors such as demand variability, lead time variability, carrying costs and ordering costs. Additionally, monitoring inventory levels regularly is essential to ensure optimal performance.

By implementing one or more of these inventory models correctly in your business operations management system you will minimize waste while maximizing efficiency which leads to improved profit margins.