Duncan Casey: Ireland need to patch up the Swiss cheese effect

Sam Simmonds drives to the line during the Guinness Six Nations Rugby match between England and Ireland at Twickenham Stadium on Saturday. 

The first time I heard about the Swiss cheese effect was shortly after Rob Penney arrived to coach Munster in 2012. 

It’s a concept used in risk analysis which states that ‘although many layers of defence lie between hazards, there are flaws in each layer that if aligned, can allow the accident to occur’.