To	provide	confidence	for	 our	stakeholders	in	our	reporting	Ernst	 &	Young	provides	limited	assurance,	 in	accordance	with	the	ISAE	standard,	over	specified	data	and	related	 performance	disclosures	in	our	2015	 Annual	Report	and	Bigger	Picture	2015	 Sustainability	Report,	as	well	as	an	 assessment	of	Telstra's	application	of	 the	principle	of	materiality,	as	outlined	in	 the	Global	Reporting	Initiative	(GRI)	G4	 guidelines.