Waste A%
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Possible reasons for a resource not being available for productive use include:

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The cost of a resource being unavailable can be disproportionately high viz:
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A key team member goes absent, delaying any work by the rest of the team until he returns eg the surgeon heading an operating team
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Regular absenteeism by team members, a sign of low morale, puts more pressure on team-mates or more staff, or more overtime, having to be employed if customers’ demands are to be met
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A key component is out of stock, stopping all work further down the line
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A key piece of equipment or a computer breaks down, stopping all services until it’s repaired
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A hospital operating theatre which closes every night, over weekends and on bank holidays, causing many patients to suffer for longer
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There’s a limit to availability percentages, however – 100% is impossible to achieve:
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People need holidays and inevitably some will fall ill – they also need ‘rest-breaks’ throughout their working day, especially to refresh their grey cells
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Suppliers will not always be able to deliver on time
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Customer demand will fluctuate and sometimes cause even the best stock control systems to suffer stockouts
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Machines will break down, and need regular maintenance stops
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Hospital beds cannot be made available 100% of the time – downtime is needed for vital cleaning and changing of sheets, otherwise the risk of cross-infections is greatly increased