Making a mistake once is good for your education. Making it twice means you're not learning fast enough.
On Tuesday, Twitter suffered its second denial-of-service attack in a week. Admittedly the site stood up better, being down for only 30 minutes this time. But it demonstrates the importance of immediately beefing up security following a damaging incident that might be repeated.
Customer perception drives business value. To go down once is unfortunate, to go down twice can seem careless, but to go down three times might suggest that the wheels are coming off.
