Workforce, Inventory and Oscillation model from Vensim user guide.

From Jay Forrester' Principles of Systems

From Jay Forrester' Principles of Systems

Workforce and Inventory model

This is a first go at a simple inventory system. No delays between Orders and Deliveries. Inventory fails to attain the level of Desired Inventory.

This model includes Average Sales in Orders to bring some stability and allows Inventory to attain the level of Desired Inventory.

It is a simple model to show how different parameters like inventory adjustment time and delay in ordering affect the inventory replenishment system. User can change values of all the parameters.

This model includes Average Sales in Orders to bring some stability and allows Inventory to attain the level of Desired Inventory.

Replenishment model with Consumption and Lead Time variability.

A demonstration of a simple min/max inventory system

This model includes Average Sales in Orders to bring some stability and allows Inventory to attain the level of Desired Inventory.

This model assumes Sales are constant and used to calculate the number of items on orders

This model includes Average Sales in Orders to bring some stability and allows Inventory to attain the level of Desired Inventory.

Models the behaviour of ​Blood Bank and Hospital blood inventories in response to a step change in the demand for transfusions.  Delays can be set for the delivery of blood to the hospitals and for the response of donors to a request for more blood.

Workforce and Inventory model

This model includes Average Sales in Orders to bring some stability and allows Inventory to attain the level of Desired Inventory.

Supply Demand Inventory Modle

This model uses Step function

This is a first go at a simple inventory system. No delays between Orders and Deliveries. Inventory fails to attain the level of Desired Inventory.

This model using Ramp function