throughout his book explains that an organization which does not have a succession planning system in place i.e. they lack a formal succession plan find trouble in various areas such as : key positions are not filled in an timely manner, key positions are filled by external candidates, constant horror of turnover at key positions, potential replacements are never ready and lack essential skills, most qualified talent is not retained. These are some problem areas which organizations face and never realize. It's just due to lack of formal planning.