That's not easy to answer. You need them but you need to limit them as well. Also you have to be cautious of ADD coworkers who introduce new tools every week, '

That's not easy to answer. You need them but you need to limit them as well. Also you have to be cautious of ADD coworkers who introduce new tools every week, 'hey look I found a new Trello integration, ...' Main rule: avoid anything synchronous as much as possible such a chat, Slack, group chat, Skype, just turn that shit off; if someone wants to catch you he will call you on the phone You need some project management tool for progress tracking and for enabling good specs, but only one; so get either Trello or Asana but not both; though can have have both for different dept.s and task types