This paper explains the rationale and overall concept for defining a risk-based approach to the design and technology usage of systems to achieve a set of differentiated business availability and recoverability classes. It provides an overview of the various dimensions being taken into consideration and also elaborates on the aspects that drive the differentiation of best practices or technical capabilities used to achieve the different classes.The paper elaborates on the generic process aspect of assessment of existing systems. It explains how we would utilize this foundation to establish guidelines for applications, the underlying technology and infrastructure, as well as the operational set-up.The principal motivations for the availability and recoverability classification are i) to improve the ability to fulfill the required levels of availability and recoverability and ii) to optimize the investment and operational cost. Businesses will classify their availability according to the distinctions defined here which will limit the extent of high cost critical applications. Additionally, applications will architect their designs for lower cost methods of achieving the desired level of availability.There is no cookie-cutter formula to accomplish these goals. Only if all pieces and building blocks of the architecture are designed from the beginning to fit to each other, will the entire system achieve optimized service availability levels.

a 78-year-old patient presented with a life-threatening lower gastrointestinal bleeding secondary to an aortoiliac graft-enteric fistula into the sigmoid colon on the background of an adenocarcinoma and diverticular disease. Bridging endovascular stent followed by a second-stage graft explant and autologous vein reconstruction with a simultaneous anterior resection was successfully performed.

Key Clinical MessageIliac artery‐enteric fistula is a rare cause of lower GI bleeding and can cause life‐threatening consequences. A high degree of clinical suspicion is needed in patients with previous aortic surgery to allow early multidisciplinary intervention.AbstractThis case study discusses the staged management of a 78‐year‐old patient presenting with life‐threatening lower gastrointestinal (GI) bleeding secondary to an aortoiliac graft‐enteric fistula (GEF) into the sigmoid colon on the background of an adenocarcinoma and diverticular disease. The patient had an aorto bi‐iliac synthetic dacron graft repair of an abdominal aortic aneurysm (AAA) some 20 years ago. Here, we present a case of successful endovascular treatment of massive hemorrhage as a bridge to definitive second‐stage dacron graft explant and autologous vein reconstruction with a simultaneous anterior resection.