Points #3 and #10.... IT staff are people too and deserve "time off" as much as people in other departments. Typically if efficiency and appropriate management can be enable by IT then the same practices can be employed to manage IT systems, meaning, there won't always be a need to work out of 9-5 or turn off the mobile. You manage IT systems rather than IT systems managing you.
Besides if your getting calls 24/7 on the cell/mobile phone, in my experience it's usually non IT people asking the same question over and over again in different contexts, meaning they just aren't bothered with learning new things themselves. If you think about it, technology drives us all, meaning EVERYONE has to continue learning (I'm not just talking about computer systems either in this case). If anyone falls behind, they get left behind.
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