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{{Short description|Software designed to support and optimize warehouse and distribution center management}}
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A '''warehouse management system''' ('''WMS''') is a set of policies and [[Business process|processes]] intended to organise the work of a [[warehouse]] or [[Distribution center|distribution centre]], and ensure that such a facility can operate efficiently and meet its objectives.
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A '''warehouse management system''' ('''WMS''') is a software application designed to support and optimize warehouse functionality and distribution center management. These systems facilitate management in using simplified automatic technologies useful in daily activities like planning, organizing, staffing, directing, warehousekeeping and controlling the utilization of available resources, to move and store materials inside, around and outside of a [[warehouse]], while supporting staff in the performance of material movement and storage in and around a warehouse, without causing any large scale disruption to business resources.
 
In the 20th century the term 'warehouse management information system' was often used to distinguish software that fulfils this function from theoretical [[Management system|systems]]. Some smaller facilities may use spreadsheets or physical media like pen and paper to document their processes and activities, and this too can be considered a WMS. However, in contemporary usage, the term overwhelmingly refers to computer systems.
== Use case ==
 
The core function of a warehouse management system is to record the arrival and departure of inventory.<ref name=":0">{{Cite book |last1=Bartholdi |first1=John J |url=http://www.warehouse-science.com/ |title=Warehouse & distribution science |last2=Hackman |first2=Steven Todd |date=2006 |publisher=The Supply Chain and Logistics Institute, School of Industrial and Systems Engineering, Georgia Institute of Technology |location=Atlanta, GA |pages=34 |language=English |oclc=938330477}}</ref> From that starting point, features are added like recording the precise location of stock within the warehouse, optimising the use of available space, or coordinating tasks for maximum efficiency.<ref name=":1">{{Cite journal |last1=Faber |first1=Nynke |last2=de Koster |first2=René (Marinus) B.M. |last3=van de Velde |first3=Steef L. |date=2002-01-01 |title=Linking warehouse complexity to warehouse planning and control structure: An exploratory study of the use of warehouse management information systems |url=https://doi.org/10.1108/09600030210434161 |journal=International Journal of Physical Distribution & Logistics Management |volume=32 |issue=5 |pages=381–382 |doi=10.1108/09600030210434161 |issn=0960-0035}}</ref>
Warehouse management solutions are primarily tactical tools, purchased and used by businesses to satisfy the unique customer demand requirements of their supply chain(s) and distribution channel(s), when the inventory and workload is larger than what can be handled manually, with spreadsheets.
 
There are 5 factors, that make it worth establishing or renewing a company’s WMS. A successful implementation of the new WMS will lead to many benefits, that will consequently help the company grow and gain loyal customers. Number one, helping not only logistics service providers but also their customers to plan the resources and inventory accordingly, is real-time inventory management. Furthermore, when a company screens/scans a product for every movement in the facility, the location of products, inventory control and other activities are clear and the possibility of mishandling any inventories declined greatly. The third factor that emphasizes the importance of WMS systems is faster product delivery, which is very valued in today’s fast-paced world with a highly competitive environment. The benefits of advanced WMS systems are not only seen when a company needs to send products to its customers/partners but when dealing with returns as well. Managing and taking care of customers’ returns becomes much easier and more effective if the company is able to monitor and track the returned inventory. Lastly, a successful WMS implementation will help the company to perform all their operations seamlessly and thus lead to improved overall customer satisfaction.<ref>{{Cite journal |last1=Andiyappillai |first1=Natesan |date=2020 |title=Factors Influencing the Successful Implementation of the Warehouse Management System (WMS) |url=https://www.ijais.org/archives/volume12/number35/andiyappillai-2020-ijais-451896.pdf |journal=International Journal of Applied Information Systems (IJAIS) |volume=12 |issue=35 |issn=2249-0868}}</ref>
== Features ==
 
== Levels of complexity ==
A WMS uses a database configured to support warehouse operations, containing detail describing a variety of standard warehouse elements including:
# Individual [[Stock keeping unit|stock keeping units (SKUs)]] that are handled and stored, e.g., weight, dimensions, case pack, automatic ID labels (bar codes, etc.), and inventory by location with manufacture date, lot code, etc. SKUs may include basic materials, fabricated parts, assemblies, and industrial and consumer finished goods, etc.;
# Warehouse storage locations, e.g., individual location number, picking sequence, type of use (picking, reserve storage, etc.), type of storage (each, case, pallet), location size or capacity, storage restriction (flammable, hazardous, high value materials, outdoor, etc.), etc.;
# Dock doors, e.g., individual number, etc.; and
# Expected labor productivity rates by function or activity, e.g., cases picked per man-hour, etc.
 
More complex warehouse management systems tend to include specialised features designed for specific industries or types of facility, while legacy enterprise software vendors aim to offer as many of these features as possible in a ‘one-size-fits-all’ solution, which may be available as modules.
Daily management functions include
# Planning – finalizing the daily plan for receiving dock activity, selecting the workload/orders to be processed in the day or shift, (this may also be done by the business system), and calculating an estimate of the labor and vehicles required to pick and ship the orders to ensure the staffing is appropriate, and to notify carriers regarding to load and depart to meet customer requirements.
# Organizing – sequencing the orders to be picked. Organizing orders for picking can be accomplished in many ways, meeting the needs of the user. The primary objective is to be intentional, and not to pick the orders in the sequence in which they were received unless the company wants to pay a carrier make sense for transportation and delivery. The initial way of organizing was called wave planning or [[wave picking]], with two objectives, a. to minimize need for dock staging space, by having orders arrive at the shipping dock in trailer load sequence, and b. to create an order of flow that will support monitoring the progress through the day and eliminate/reduce last minute requests for overtime or delay of carrier departure, etc.
# Staffing – assign staff to work functions and areas, by wave, to minimize staging.
# Directing – ensuring the documented processes and procedures are embedded in the WMS and are consistently applied, used and appropriate for the nature of the work and service level intentions of the company (e.g., International Standards Organization 9000 (www.iso.org)). This function may also be used to divide individual orders into logical work units and the ability to assign them to separate individuals potentially for simultaneous performance, consistent throughput requirements and physical layout, e.g., separating individual case picking from each unit picking, and individual pallet load picking, to improve productivity and support Control.
# Controlling – providing milestones for management to monitor progress through the day, providing the opportunity to respond to problems in a timely way, and report data for performance analysis.
 
Academic research has made use of an approximate classification system based on 3 levels of complexity:<ref>{{Cite book |url=https://www.worldcat.org/oclc/456838083 |title=Facilities planning |date=2010 |publisher=John Wiley & Sons |others=James A. Tompkins |isbn=978-0-470-44404-7 |edition=4th |location=Hoboken, NJ |pages=385–386 |oclc=456838083}}</ref>
== Integration ==
 
# [[File:Typical features of a Warehouse Management System.png|thumb|520x520px|Some common features of an advanced WMS]]A '''basic WMS''' supports inventory management and location control. The performance data that can be produced at this level is generally limited to ‘throughput’, i.e.: how much stock moves through the warehouse in a given period of time. A basic WMS is almost indistinguishable from a basic [[Inventory management software|Inventory Management System]].
Warehouse management systems support warehouse staff in performing the processes required to handle all of the major and many minor warehouse tasks such as receiving, inspection and acceptance, put-away, internal replenishment to picking positions, picking, packing, value added services, order assembly on the shipping dock, documentation, and shipping (loading onto carrier vehicles). A warehouse management system also helps in directing and validating each step, capturing and recording all inventory movement, and status changes to the data file.
# An '''advanced WMS''' can analyse capacity and stock levels, and perhaps track how much time and labour is spent on different activities. This allows it to generate data that measures efficiency and suggest ways to improve it. Outside of East Asia, Most WMS's in use today fall into this category. At this level, the duties of the WMS may begin to overlap with or supersede those of a [[Warehouse control system|Warehouse Control System]] or [[Warehouse execution system|Warehouse Execution System]].
# A '''controlled WMS''' can exchange data with other systems, in order to take into account information from outside the warehouse (e.g.: manufacturing needs, customer orders, transportation) when planning activities, and vice versa. It may control or obtain feedback from [[automation]] or [[Industrial internet of things|IoT devices]], in facilities that have them. It may also continuously simulate or test strategies for improving operations, perhaps using [[machine learning]]. The most complex WMS's are almost indistinguishable from the most complex WES's.
 
== Types of installation and licensing ==
A warehouse management system usually represents the central unit in the software structure of a warehouse. The WMS receives orders from the overlying host system, mostly an ERP system, manages these in a database and, after appropriate optimization, supplies them to the connected conveyor control systems.<ref>{{Cite web|url=https://warehouse-management.com/What-is-a-WMS-92163.html|title=What is a Warehouse Management System?|website=warehouse-management.com|language=en|access-date=2017-08-25}}</ref>
 
WMS software has historically been offered through a perpetual licence, giving organisations the permanent right to install it on their own on-premise servers, typically alongside a fixed period of updates and technical support which may be renewed at additional cost.
This becomes clear when you look at the processes necessary for e-commerce: as soon as a customer places an order on a website the information is passed along via the business host computer (mostly an ERP system) to the WMS. All necessary steps to manage this order, pick the ordered items, etc., are then processed within the WMS. Afterward, information is sent back to the business host computer to support financial transactions, advance shipping notifications to customers, inventory management, etc.
 
As with many types of enterprise software, this provision model is gradually being replaced by [[Software as a service|hosted subscription services]]. Legacy enterprise software vendors typically offer both models, but incentivise their customers to move to the cloud.
A modern WMS will connect to a variety of communication technologies (radio frequency), automatic ID technologies (barcode, RFID, etc.), mobile computers, and occasionally automated material handling (conveyors and sortation) and storage equipment (carousels, automatic storage and retrieval, etc.).{{cn|date=February 2020}}
 
A WMS may be a standalone product, or can be a module or category of modules within a larger [[Enterprise resource planning|Enterprise Resource Planning]] (ERP) system, Shipping or Inventory Management Software, or [[Supply-chain-management software|Supply Chain Management System]] (SCMS).
==Types==
 
Installation type does not affect the level of functionality that may be achieved by a WMS, so long as sufficient computing power is provisioned and data is successfully synchronised with other systems.
Warehouse management systems can be standalone systems, part of supply chain execution suites, or modules of an [[enterprise resource planning]] (ERP) system. Depending on the size and sophistication of the organization, warehouse management can be as simple as handwritten lists or spreadsheets using software such as [[Microsoft Excel]] or [[Microsoft Access|Access]], as well as specialty WMS software systems.
 
== Comparison with other software packages ==
== See also==
{{Business logistics}}'''[[Inventory management software|Inventory Management Software]]''' is used in many industries, such as manufacturing, retail and hospitality. Like warehouse management systems, its foundational feature is tracking stock levels of different materials. These two types of software begin to differ at more advanced levels. For example, a service business with a relatively simple ‘warehouse’ or storeroom is more likely to require features that analyse the cost of materials it consumes, or the optimal moment to purchase additional stock, rather than complex WMS features that focus on efficient movement of material within the warehouse itself.
* [[Automated storage and retrieval system]]
 
* [[Data warehouse]]
Many '''[[Enterprise resource planning|Enterprise Resource Planning]]''' systems include a warehouse management module or set of modules. The core logic of an ERP system is transactional in nature; its purpose is to connect operational and commercial data to accounting and financial decision-making. As a result, its warehouse modules tend to focus on the metrics that are immediately and obviously relevant from a financial point of view, and tend to lack the sophistication of advanced WMS's.
* [[Document automation]]
 
* [[Enterprise resource planning]]
Integrated '''[[Supply-chain-management software|Supply Chain Management]]''' software packages tend to bring together warehouse management with transportation management and additional functionality. Unlike ERP systems, these systems usually focus on operational needs. However, like ERP systems they tend to lack the depth and configurability of a specialised WMS.
* [[Inventory management software]]
 
* [[Manufacturing resource planning]]
The terms '''[[Warehouse control system|Warehouse Control]]''' and '''[[Warehouse execution system|Warehouse Execution]]''' systems are sometimes used interchangeably with each other and with warehouse management systems. However, a WCS traditionally manages motorised equipment such as conveyor belts, as may be found in facilities handling high-volume, low-variety materials. As automation equipment has grown more sophisticated, it has been employed in more complex facilities, giving rise to WES nomenclature for systems that integrate advanced controls and WMS capabilities. As more features are added to each side, the distinction between a high-end WES and WMS blurs.
* [[Pick and pack]]
 
* [[Shipping list]]
'''Yard Management Software''' is generally aimed at large facilities and organisations that manage their own transport fleet. It can be a standalone system, or a module of a WMS or SCMS. In terms of functionality, a YMS may track an inventory of vehicles, parking spaces and resources, coordinate the movement of full and empty trailers, or manage appointments in order to better predict workload.
* [[Voice-directed warehousing]]
 
* [[Warehouse control system]]
'''Dock Scheduling''' may be available as a component of a YMS, SCMS or WMS, but usually with a low level of sophistication. Standalone dock scheduling software more frequently includes features that acquire data about incoming loads in advance, or restrict carriers to specific time slots or durations.
* [[Warehouse execution system]]
 
== Use caseMarket ==
 
According to a report by Grand View Research, “The global warehouse management system market size is expected to grow from US$2.8&nbsp;billion in 2021 to $6.1&nbsp;billion by 2026, at a [[compound annual growth rate]] of 16.7%.”<ref>{{Cite web |title=Warehouse Management Systems Market Report, 2021-2028 |url=https://www.grandviewresearch.com/industry-analysis/warehouse-management-system-wms-market |access-date=2022-03-23 |website=www.grandviewresearch.com |language=en}}</ref>
 
The authors of Warehouse Science note that “there are over 300 WMS vendors in the US alone. The largest companies hold less than 20% of the market.”<ref name=":0" />
 
== Limitations ==
Edward Frazelle, the founding director of Georgia Tech Supply Chain and Logistics Institute, argues that while the demands on warehouses are increasing in an increasingly competitive global marketplace, “warehouses today have... less warehouse management system capability (a by-product of Y2K investments in enterprise resource planning systems)”<ref>{{Cite book |last=Frazelle |first=Edward |url=https://www.worldcat.org/oclc/951429325 |title=World-class warehousing and material handling |date=2016 |isbn=978-0-07-184283-9 |edition=2nd |location=New York |pages=14 |oclc=951429325}}</ref>
 
Researchers from the [[Rotterdam School of Management, Erasmus University|Business School at Erasmus University Rotterdam]] in the Netherlands have pointed out that “a standard WMS remains largely making compromises between the way a warehouse wants to work and the way the system allows the warehouse to work. In certain environments, such compromises might seriously degrade warehouse performance.”<ref name=":1" />
 
Many researchers and analysts have pointed out that receiving operations, which account for about 17% of warehouse operating costs, are a particular area where contemporary warehouse management systems tend to fall short, particularly insofar as pre-scheduling and communications with external carriers, customers and suppliers represents a bottleneck.<ref>{{Cite book |last=Ghiani |first=Gianpaolo |url=https://www.worldcat.org/oclc/54449316 |title=Introduction to logistics systems planning and control |date=2004 |publisher=J. Wiley |others=Gilbert Laporte, Roberto Musmanno |isbn=0-470-09165-7 |location=Chichester, West Sussex |pages=159 |oclc=54449316}}</ref>
 
Software vendors have suggested that “In cases where moving away from a legacy WMS is not possible, its shortcomings can still be addressed by smart integrations, earning the warehouse breathing room in the medium-term.”<ref>{{Cite web |title=How to get around the limitations of your Warehouse Management System |url=https://datadocks.com/posts/how-to-get-around-limitations-warehouse-management-system/ |access-date=2022-03-23 |website=datadocks.com}}</ref>
 
==References==
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[[Category:Automatic identification and data capture]]
[[Category:Radio-frequency identification]]
[[Category:Logistics]]
[[Category:Supply chain management]]
[[Category:Management cybernetics]]
[[Category:Management systems]]