Factors for when assessing warehouse/stock locations - some will conflict
Cost of location
Availability and suitability of the Building
Availability and suitability of the staff
Nature of the items stored
Access to transport infrastructure
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Qualitative Analysis
Analysis based on opinions and statements (which are often non quantifiable) rather than numerical or statistical evidence.
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Quantitative Analysis
Analysis based on numerical or statistical based information rather than opinions or statements -
This may include Cost analysis of current premises and future predictions which could include cost such as costs per cubic metre or cost per order.
Cost analysis for routine operations, they are not based on premises but costs per product, or costs of operating by the hour
But can also involve current inventory performance measures such as lead times, service levels, rate of stock turn, stock outs over a set time frame.
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warehousing common structural design features include
Single floor design/layout
Multiple floors design/layout
Light, temperature, humidity and ventilation
Warehouse equipment requirements
Getting goods in and out
Stock yard design
Health and safety
Security
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Zoning
An arrangement in a stock yard warehouse or stores facility where areas are determined based on requirements for different access or the characteristics of different types of equipment or stock
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Solutions to high irregular or seasonal demand problems
Creating flexibility in the design of the building and layout to allow for seasonal additional storage
Eliminating unused and unwanted stock to free up space
Acquiring temporary additional storage
Getting a supplier to hold additional stock for short notice delivery
Getting a supplier to deliver to customers or usage point
Getting a specialist logistics company to support the additional demand
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Waste handling space needs to be considered in a warehouse design and may be needed to facilitate the following
Unpacking of bulk items
Adding additional labels
Grouping products that need to be sold together e.g. desktop computer which will also require a screen
Kitting - this involves preparing a wide range of items into a single unit for example a maintenance kit requiring springs, seals, lubricants
Return (reverse) logistics - processing of customer returns and payments
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What types of warehouse layout did Gue and Meller (2009) design instead of opting for ‘straight rows’?
Fan shaped layout
Herring bone shaped layout
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Warehouse Aisle widths
Typical range 2.5 to 4.5 M
Narrow Aisle design 2M
Very Narrow design 1.4M
For non equipment access widths can be a narrow as 1M
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Flexibility to meet additional peek demand solutions
Temporary storage on site (example containers placed in the yard)
Temporary storage in other buildings, either rented or owned
Adopting flexible warehousing example a shared facility or very short term warehousing where space is made available online and is bid for (this is an emerging market from 2013)
Suppliers holding stock with arrangements for short notice deliveries or collections
Use of third party logistics company storage facilities
‘Early’ delivery of stock or supply on a consignment basis by negotiation with customers
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Consignment Stocking
A facility offered by a supplier to a buyer to allow a delivery of stock to a buyer with payment only after it is used or sold to a customer
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Product Coding structures can be
Numerical
Alphabetical
Alpha-numeric
Random generated or created
Sequential
Structured
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OEM
HS
WCO
PAR
B2B
B2C
IAN
GTIN
EAN
Original Equipment Manufacturer
Harmonised System
World Customs Organisation
Planed All Round
Business to Business
Business to consumer
International Article Number
Global Trade Item Number
European Article Number
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Product documentation that can be available by entering a product code into a suppliers website
Installation Instructions
Operational Instructions
Guarantee and warranty
Technical specifications inc temperature tolerances
Safety Instructions inc disposal guidelines
Electrical certification documents
Packaging certification documentation
Spare parts list, servicing requirements
Product recall notices
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Product Code usage links
Technical Specifications
Pricing Detail
Costing Analysis
Sales Analysis
Safety Instructions
Handling Instructions
Picking Instructions
Packing Instructions
Despatch Instructions
Invoicing Detail
Order Confirmation Detail
Order Detail
Links to suppliers and manufacturers
Location Finding
Stock Control
Stock Availability
Product Catalogue and descriptions
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GTIN
Global Trade Item Number, system is controlled by a ‘non for profit’ organisation known as GS1. GS1 specialises in standards for specific industries and membership is required to use the standards.
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EAN-13
European Article Number is compatible with electronic codes used in radio frequency identification.
EAN standard is an 8 digit code (used in small items) but most firms use an EAN13
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Bar codes can be used for many different operations such as..
Identifying individual products, groups of products including outer packaging and pallets, content of a purchased order or delivery, batch that the item comes from, original producer, routing of a delivery, production date, delivery date, used by date, specific item being produced to a one off specification, arrival or departure of a product location,
Allowing for effective return or refunds of products
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RFID
Radio Frequency Identification,
Two types - Passive = does nothing until asked what it is, Active = periodically announces what it is. - Both can be tracked where it is.
Size 2mm squared by 2mm thick and can hold upto 2000 characters
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RFID’s can be used to do the following
Track individual items
Track Boxes of products, cages of products and pallets
Track containers with multiple loads
Locate equipment in a particular building
Trigger alarms should equipment or stock be removed without authorisation
European Pallet Association standard specification
UCI1435-2 they measure 800mm x 1200mm
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UK Pallet Standard Specification
1200mm x 1000mm
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Objectives of packing and packaging
Protect the product from damage in transit
Protect the product itself from damage
Protect handlers and product from harm
Comply with transport or legal requirements
Meet and organisations image and marketing objective
Meet an organisations environmental commitment
Meet a cost target in order to maintain profitability
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Standard Box Terms
BDCM = Bulk Distribution Carton Metric
BDC = Bulk Distribution Carton
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Void Filling options
Polystyrene Chips (not good for the environment)
Chip of a maize base (bio-degradable)
Vermiculite - light absorbent material in small pieces plus fire resistant
Shredded Paper or shredded wood based material or wool wool is a lightweight solution
Cardboard Chips and shredded cardboard more environmentally friendly
Paper and cardboard rolls - made into ball to fill the void
Bubble Wrap
Air-filled cushions
Self-expanding foam
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ISO
International Organization for Standardisation
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ISO objectives were to provide a set of procedures which aim to do the following
Reduce Environmental impact
Support Innovation in products, packaging and the supply chain
Avoid undue restrictions on the use of packaging
Prevent barriers and restrictions to trade
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ISO 18601
General requirements for the use of ISO standards in the field of packaging and the environment
(this concept of supplier responsibility encourages the supply chain approach v’s ‘not my problem’)
(this standard introduces the theme of selecting system packaging that considers the whole life approach)
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ISO 18602
Packaging and the environment - Optimizationof the packaging system
(Primary packaging - packaging which touches the product)
(Secondary or group packaging - the packaging which is designed to contain one or more primary packaging together with any protective materials)
(Tertiary, distribution or transport packaging - the packaging of items for specifically for distribution/transport)
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ISO 18603
Packaging and the environment - Reuse
(this standard specifies the requirements for a packaging to be classified as reusable and sets out procedures for assessments of meeting the requirements, inc associated systems)
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ISO 18604
Packaging and the environment - Material Recycling
(This standard uses definitions which clarify expectations of packaging recycling. This includes a broader definition of the recycling process which excludes energy recovery and fuse use)
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ISO 18605
Packaging and the environment -Energy Recovery
( This standard specifies the requirements and assessment procedures for packaging to be classified as recoverable in the form of energy recovery)
(the standard reflects the interest and practice of burning waste to create hot water, steam or electricity)
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ISO 18606
Packaging and the environment - Organic recycling
(this standard uses technical definitions of the processes and expectations of organic recycling, this involves biological waste treatment processes applied to use packaging to produce compost)
(The standard reflects the interest and practice of commercial operators and this is not related to landfill type operations)
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GRN
Goods Received Note
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AGVs
Automated Guided Vehicles = Ocardo grid system robots Minimum human intervention
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Stock held by a business can be categorised or classified. With the following key distinctions -
Opening stock , work in progress, safety stock and finished goods.
Obsolescent and redundant stock
Direct and indirect supplies
ABC classifications of stock that may apply
Dependant demand and independent demand items of stock.
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Work in progress (WIP)
In inventory management the expression relates to stock part-way through a manufacturing process, in the services sectors the term is also used for anything in between order and delivery.
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Classification of stock within the manufacturing process
Raw Materials
Components
Work in progress
Finished goods
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Value Chain
Raw materials and components
Work in progress
Finished goods
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Stock holdings which must be avoided
Obsolescent - means no longer used or practised, outmoded, out of date = unfinished goods, demand must reach zero think out of date food
Redundant - means superfluous, excessive, surplus, unnecessary = stock which is used somewhere by someone, demand for the product would come from other parties not current customers
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Causes of obsolescence stock holding
Technological change
Cultural Change
Legislation
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Causes for redundancy
Poor forecasting and demand
Week customer relationships leading to cancelled orders
Overstocking/poor stock control
Change in internal poliy
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Way to avoid redundant or obsolete stock
Good market knowledge and accurate forecasting
Good stock control techniques inc regular stock audits
Good inter departmental communication
Just in time supply chains
Reduced batch sizes in production
Good sales and operating planning (S&OP)
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Summary of costs associated with redundant or obsolescent stock
The loss of manufacturing capacity
The stock holding costs - warehousing space, insurance,security,auditing
Loss of profit on unsold goods
wasted inputs (raw materials)
The loss of working capital
Disposal cost especially if to landfill
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Direct supplies
Supplies that are integrated into finished products, examples of raw materials or components which require processing into finished goods. They may not be completed consumer goods which are sold directly to the end user.
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Indirect supplies
Supplies not incorporated in the finished product but which keep the business and factory operating. They can be spare machinery, tools, oils and lubricants, stationary
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Pareto Principle (80/20) Rule
The theory that 80% of outcomes results from 20% of inputs, example 80% of sales are to top 20% of customers, 80% of inventory spend is accounted for by the top 20% of stock items.
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Inventory type by part numbers and value
A - % of part numbers 20% - % of total cost 80%
B - % of part numbers 30% - % of total cost 15%
C - % of part numbers 50% - % of total cost 5%
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Stock Profile
The description of stock items in terms of value, rate of turnover, storage characteristics etc.
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Dependent Demand
The requirement for a stock item which is directly related to and therefore dependant upon the rate of production (examples are raw materials, components, energy.
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Independent Demand
The requirement for a stock item which is not directly related to and is therefore independent of the rate of production examples machinery spares, office equipment, and consumables.
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GAAP
General Accepted Accounting Practice
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Liquidity
The ease with which assets can be converted into cash.A firm with a high value asset base but low liquidity may struggles to meet its debts on time.
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Ordering/acquisition costs include some or all of the following
Preparing the requisition
Supplier selection and approvals
The times and costs of the procurement process
The IT ordering platform
Other EDI links to suppliers (EDI= Electronic data interchnge)
Preparing the purchase order
The cost of the ERP system time - (ERP = Enterprise Resource Planning)
Printed stationary
Progressing or chasing the order
Receiving or receipting of goods
The cost of materials or goods
Handling
Inspection or part approval and management of sub-standard goods
Dealing with mismatch receipts & wrong invoices
Approval and payments of invoices
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Ordering/acquisition costs three main groups
1. Preliminary costs - costs associated with actions before the raising of purchase orders 2. Placement costs - the cost of raising the purchase order and ensuring the supplier has received it 3. Post-placement costs - the costs post purchase order in receiving of the goods to requesting payments to be made to the supplier
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Purchasing Card (procurement card)
Essentially a credit card owned by the company that enables an officer to make low value purchased without the need for formal requisition and purchase orders
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P2P
Procure to Pay
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Two types of holding costs
Costs related to the value of the goods
1. Financial costs (tied up working capital)
2. Cost of insurance 3. Losses due product deterioration 4. Losses due to obsolescence and redundancy of inventory 5. Losses due to theft, accidental damage
Costs related to the physical characteristics of this inventory
1. Storage space - rent, rates, racking, IT systems, maintenance or repair of the building 2. Power, heat & light of the building 3. Movement equipment - forklift, scissor lift, pallet trucks 4. Labour costs - to run, handle, inspect, audit and issue inventory reports 5. Administration costs - maintaining of the store records,
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Costs associated to a stockout
Loss of production output
Costs of machine downtime
Costs of the action required to deal with the stockout which could include buying from a more expensive supplier, paying for an urgent delivery, switching to another form of production, using alternate parts
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Options to reduce costs whilst mitigating negative impact on service levels
Using lead times and costs of holding as part of the price evaluation
Strategically placed safety stock
Vendor owned stock
Increased overall inventory levels
Understanding demands such as seasonal or adhoc fluctuations
Sourcing decisions based on supplier performance
Using KPIs to improve supplier performance and eliminate bottlenecks
Robust supplier relationship management using agreed KPIs to drive continuous improvement
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Cost benefit analysis for each type of stock - questions are
What is the probability of a stockout occuring?
What are the cost impacts if this was to happen?
What are the costs of holding safety stock at different levels, in different locations?
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Risk Management approach to stockouts
Assess the risk, which is the combination of likelihood and severity of impact
Assess the cost of mitigating the risk (in stockout = cost of holding safety stock)
The difference between the expected demand inventory levels and the point at which the likely and potential cost of stockouts falls below the cost of holding additional inventory defines stock safety
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Lysons and Farrington state that forecasting should involve six basic questions -
1. What is the purpose of the forecast? 2. What is the time horizon? 3. What techniques are most appropriate? 4. On what data must the forecast be based and how should it be analysed? 5. In what form shall the completed forecast be presented? 6. How accurate is the forecast?
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Subjective Forecasting
Qualitative forecasting
Based on human opinion and insights that are not shown in hard data.
Uses expert opinion, market research, surveys and structured questioning methods such as the Delphi method.
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Objective Forecasting
Quantitative forecasting
Based on hard data, facts and figures
The principle is that information from the past can predict the future, five elements are used to do this -
1. The average, mean, medium point of observations 2. Trends - an increase/decrease in average over time 3. Short term cyclical movements (seasonal influences) 4. Long-term cycles - these maybe unpredictable or unexplained 5. Random Errors - variations which cannot be explained
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Two main statistical techniques used in inventory forecasts
Moving Average - a calculation to analyse data by creating a series of averages of different subsets of the full data. Commonly used with time-series data to smooth out short term fluctuations
Weighted Average - a calculation which attaches more importance to some elements of the data than others
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Exponentially Weighted Average Method (EWAM)
A statistical methodology which can be used give more importance to the most recent data
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Examples of things that can distort demand
Unplanned sales promotions
Sales team incentive
Over- ordering by a customer (due to historical poor delivery)
Cancelling of these over orders
Changes to bulk freight volumes, masking true demand
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Bull Whip Effect / Forrester Affect
Distorted demand increasing up the supply chain
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Three widely expected reorder ways used for independent demand
Fixed Quantities
Economic Quantities
Time or periodic review
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Fixed Quantity Orders
Fixed quantity orders are those with a predetermined quantity every time.
Systems can be used to set a minimum stock level once this level is breached this will send a automatic replacement orders to a supplier
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Economic Order Quantities (EOQ)
EOQ is a decision tool used in cost accounting. Its formula allows you to calculate the ideal quantity of inventory to order for a given product. The calculation is designed to minimise ordering and holding cost.
The EOQ formula makes a number of assumptions
The same quantity is ordered at each reorder point
Customer/user demand for the stock item is known
The relevant ordering and holding costs are certain
The purchase order lead time is known.
The cost per unit is fixed.
Inventory levels and customer/user demand is monitored carefully and sufficient inventory is held to ensure not stockout occur.
There is no quality costs
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The EOQ formula uses the following 3 variables
1. Demand 2. Ordering cost (calculated per order) 3. Holding cost (calculated per unit)
Square Root ((Q=2x demand x ordering cost) /carrying costs)
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Lysons and Farrington suggest the following mathematical formula to determine the maximum stock level
M=W(T+L)+S
M = Maximum stock levels
W= average rate of stock usage
T = Review period
L = stock item order lead time
S = Safety stock
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MRP
Materials Requirements Planning is defined as a method of provisioning which depends upon the master manufacturing schedule as a distinct from statistical predictions, The schedule defines when finished batches and items are needed in production.
MRP was developed in the 1960’s
MRP systems answer the following questions
What items (stock) is required?
How many of them?
When?
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MRP Process
1. Using known customer orders and forecast demand a master production schedule is created. Allowing for seasonal fluctuations. This will set the scale and rate of production needed to meet demand at the right time.
2. The next stage is to look at what is needed to produce option 1. How much stock do you hold, do you manufacture yourself or purchase externally. Creation of a bill of materials is required to understand the requirements of each product 3. Using the MRP system, BOM and inventory levels it will work out the net requirements of what to purchase and produce and when.
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MRP Benefit
The main benefit of the system is the production of exception reports which sows deviations from normal planning and performance
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MRP summary
In summary, materials requirements planning is an electronic system combining the following
Job, batch or flow production or where all are used together because of its flexibility
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MRP ll Compton and Jessop definition
a development from ‘materials requirement planning’ which encompasses the planning and scheduling activities associated with production resources to match output needed and supplies available
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MRP ll process driven by a master production schedule but encompasses the additional inputs
Production Control
The supply chain
Engineering and technical teams
Finance teams
HR
Facilities - buildings, energy and other utilities requirements
This expansion to MRP is only possible through the expansion of computing capabilities. These capabilities now include the ability to work through ‘what if’ scenarios
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ERP
Enterprise Resource Planning
Developed in the 1990 by Gartner Group (IT Company)
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ERP Compton and Jessop definition
‘A system for the coordination of planning and execution of business on a wide basis, between links in the supply chain involving more than coordination’
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Key Business links to ERP
Account Receivable
Accounts Payable
Human Resource
General Ledger
Work in progress
Sales and Distribution
Inventory
Organisations
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ERP ll
Launched in 2000
Introduced the capability for collaboration across whole supply chains
Widening of the basic applications to move beyond manufacturing to now be used in both public and private sectors
Functionality has become more user focused - making reporting more accessible to all departments and not just business analysis
A move to more open protocol permits the integration with other proprietary software that means that businesses do not need to overhaul their computer systems
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Advantages of ERP v’s MRP ll include
Improved customer service levels
Reduced inventory levels
Better inventory accuracy
Improved cash flow and revenue collections
Increased factories efficiencies - achieved by better resource locations and capacity planning.
Rework and scrap in the manufacturing processes are reduced
Better business visibility
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Disadvantages to ERP systems
ERP is perceived to be difficult and expensive to implement
Tendency to customise which adds costs and complexity and should be avoided
Hidden costs can be high- Implementation is time consuming and requires skilled input from the implementing organisation
Introduction of new software required a level of training, and a potential culture change
ERP systems due to the multiple tasks can take hours to make decisions with smaller systems such as SCM (supply chain management) DRP (distribution requirement planning) take minutes
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Common ERP systems are
SAP
Oracle
Microsoft Dynamics NAV
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JIT (Just In Time) described by Womack and Jones
‘A system for producing the right items at the right time in the right amounts. Just in time approaches just on time when the upstream activities occur minutes or seconds before downstream activities, so single pieces flow is possible. Key elements of just in time are flow, pull, standard work (with standard in-process inventories) and take time - the available production time divided by the rate of customer demand, setting the heartbeat of the lean system’
\ Or Simply by the dictionary
\ A production philosophy whereby what is needed is made when it is needed and not before
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TQM - Total Quality Management
Organisation-wide effort to improve outputs through continuous improvement in internal practicies
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JIT objectives of eliminating waste summarised in 5 Zeros
Zero Defects - to meet or exceed customer quality requirements
Zero Set up times - no or reduced set up time for production line machinery, creation of no/minimal machine downtime
Zero Inventories - reduced batch sizes, throughout the production from raw materials to WIP to finished goods
Zero Handling - using process mapping to identify duplications of effort, redesign systems & processes to remove/reduce handling operations
Zero Lead times - the ultimate aim of the JIT process. Which is currently difficult to achieve due to smaller batches whic have lead to shorter lead times