Recommendation systems are critical tools for online retailers in their pursuit of enhanced operational performance and improved shopper experience. As such, firms invest heavily to improve their algorithms. Notwithstanding these efforts, there is usually a serious omission of demand-timing...

Extreme programming (XP) calls for intense participation by users to ensure that systems are developed to meet current needs, yet be flexible enough to adapt to future needs [Beck, 2000]. In XP projects, it is crucial for developers to align their efforts with those of the users that are...