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An IMO in a large office who's a specialist in Mapping might spend all of there their time working just on mapping and GIS activities, including (in this example) coordinating an inter-agency group working on CODs. We can think of specialists as those who spend 70% or more of their time working on a specific skillset.
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Regardless of the size of the IM team, the manager should aim for a balance of skillsetsskill sets. A large team can have multiple specialists, which can be very useful for doing advanced work in each skill. A smaller office will - by necessity - need to have generalists, so they can do a little of everything.
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