External Dependency - Each year one of my tasks is to go around and repair and replace the network of over 200 bird boxes we have on the Estate. If I did not do this then the Team who monitor and ring the birds during the season would get far less occupancy rates as slowly the number of boxes available would become less and less.
Internal Dependency - I have a project planned to plant a 30m hedge on the campsite. I am however dependant on another project supplying me with the right amount and variety of hedging whips. The whips are been produces as part of a volunteer project organised by a partner agency. if this project fails it means I will not get to plant my hedge :(