public Integer getRosterAssignmentCount (Date d, Roster r) {
		
		Integer rc = 0;
		
		for (Trip t: getAllTrips(d)) {
			for (Roster tr: t.getRosterList()) {
				if (( tr.getFamilyName().equals(r.getFamilyName()) ) &&
					( tr.getGivenName().equals(r.getGivenName()))){
					rc += 1;
				}
			}
		}
		return rc;
		
	}