gistfile1.rb

def show_project(username, project_name, 
                 user: user(username), 
                 project: project(user, project_name))
  Presenter::Board.new(project, user).render
end

def user username
  User.with(username)
end

def project user, project_name
  Project.for(user).named(project_name)
end

That's right!

My example should possibly have said something like this:

def show_project(for: username, named: project_name, 
                 user: user(for), 
                 project: project(user, named))
  Presenter::Board.new(project, user).render
end

Then your code would look something like

show_project(named: 'Wunderlist', for: 'Chad')