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Stocksand flows are the building blocks from which every dynamic system is constructed. The ability to identify, map, and understand the dynamics ofthe networks of stocks and flows in a system is essential to understanding the processes of interest in any modeling effort.  \n􀀩 Be sure you have carefully read Ch. 6 and 7 of Business Dynamics before doing this assignment.  \n􀀩 Submitting your work: One member of your team should submit your team’s write up and model on the course website, as a single zip file containing a word document and a Vensim mdl file. Make sure the write up lists the full names of all members of your team.  \nA. Identifying Stock and Flow Variables  \nThe distinction between stocks and flows is crucial for understanding the source of dynamics. In physical systems it is usually obvious which variables are stocks and which are flows. In human and social systems, often characterized by intangible,“soft” variables, identification may be more difficult.  \n􀂉 A1 . For each of the following variables, state whether it is a stock or a flow, and give units of measure for each.  \n\n| Name | Type | Units |\n| --- | --- | --- |\n| Example: Inventory of beer | Stock | Cases |\n| Example: Beer order rate | Flow | Cases/week |\n\n1.  \n2.  \n3.  \n4.  \n5.  \n6.  \n7.  \n8.  \n9.  \n10.  \n11.  \n12.  \n13.  \n14.  \n15.  \n\n| Name | Type | Units |\n| --- | --- | --- |\n| Daily Sales of the iPhone 5S |  |  |\n| US National Debt |  |  |\n| China’s trade surplus |  |  |\n| Employee experience |  |  |\n| Accounts Payable |  |  |\n| College athletes declaring their intention to turn professional |  |  |\n| Book value of inventory |  |  |\n| Promotion of Senior Associates to Partner at a consulting firm |  |  |\n| Fans of Lance Armstrong |  |  |\n| Euro/dollar exchange rate |  |  |\n| Employee morale |  |  |\n| Greenhouse gas emissions of the US |  |  |\n| Interest rate on 30-year US Treasury Bond |  |  |\n| Runners passing the finish line |  |  |\n| Firm’s cost of goods sold (COGS) |  |  |\n\nB. Mapping Stock and Flow Networks  \nSystems are composed of interconnected networks of stocks and flows. Modelers must be able to represent the stock and flow networks of people, material, goods, money, energy, etc. from which systems are built.  \nFor each of the following cases, construct a stock and flow diagram that properly maps the stock and flow networks described.  \n􀀩 Not all the variables are connected by physical flows; they may be linked by information flows, as in the example below.  \n􀀩 You may need to add additional stocks or flows beyond those specified to complete your diagram (but keep it simple) . Be sure to consider the boundary of your stock and flow map. That is, what are the sources and sinks for the stock and flow networks? Are you tracking sources and sinks far enough upstream and downstream? This process of deciding how far to extend the stock and flow network is called “challenging the clouds” because you question whether the clouds are in fact unlimited sources or sinks.  \n􀀩 Consider the units of measure for your variables and make sure they are consistent within each stock and flow chain.  \n\n| Example: A manufacturing firm maintains an inventory of finished goods from which it ships to customers. Customer orders are filled after a delay caused by order processing, credit checks, etc. Map the stock and flow structure, drawing on the following variables: Inventory, Raw Materials, Production, Order Backlog, Order Rate.\u003Cbr>Solution:\u003Cbr>The unit of measure in this flow is widgets / time period. |  |\n| --- | --- |\n| \u003Cbr>\u003Cbr>Material Arrival Rate\u003Cbr>\u003Cbr>Rate\u003Cbr","cbCaivGp5qsh94IZ","https://ap.wps.com/l/cbCaivGp5qsh94IZ","pdf",284730,"English","# Assignment 3\n## Identifying Stock and Flow Variables\n## Mapping Stock and Flow Networks","[{\"question\":\"What is the main purpose of Assignment 3?\",\"answer\":\"It is designed to give practice identifying, mapping, and understanding the structure and dynamics of stocks and flows in dynamic systems.\"},{\"question\":\"How should the team submit the assignment?\",\"answer\":\"One team member submits a single zip file containing a Word write-up and a Vensim .mdl file, and the write-up must list the full names of all team members.\"},{\"question\":\"What requirements must be followed when mapping stock-and-flow networks?\",\"answer\":\"Draw a correct stock-and-flow diagram for each case, include needed sources and sinks, consider possible information flows, and ensure units of measure are consistent within each stock-and-flow chain.\"}]","15.871 Introduction to System Dynamics - Assignment 3 - Mapping the Stock and Flow Structure of Systems | PDF",1792976458,23]