Directors Ellen Fiske and Ellinor Hallin have spent years putting together the documentary, "Scheme Birds."  The piece is showing this year at the Tribeca Film Festival and follows a young woman, Gemma, who is growing up in a housing project in Scotland.  

What does it take to spend years on such a project not knowing the outcome?  Why follow this particular woman?  What's next?  The directors clue us in.