I am a developer that is managing a small group. All members of this group, including myself are working remote. One member of this group that we'll call "Bob" is having trouble and very slow to respond. As an example I will ping him in the morning and not get a response until 9PM. Another example is that he was having trouble getting our application running locally and he didn't say he was having issues for 3 days.
It is early in the project and no one else has experience working with "Bob", yet my own boss is asking me for reports on the individual team members. Already my boss is concerned about "Bob". Any good ideas or metrics on when to be concerned about a subordinate and to what extent? I'd also like to know any methods to help get "Bob" engaged without needing to fire/punish him.