Incentives for Quality over Time – The Case of Facebook Applications

We study the market for applications on Facebook, the dominant platform for social networking and make use of a rule change by Facebook by which high-quality applications were rewarded with further opportunities to engage users. We find that the change led to quality being a more important driver of usage while sheer network size became less important. Further, we find that update frequency helps applications maintain higher usage, while generally usage of Facebook applications declines less rapidly with age

The Cost of Quality Out-of-School-Time Programs, Executive Summary

Funders and program planners need a clear understanding of the costs of quality afterschool or summer programs to make sound investments. With support from The Wallace Foundation, P/PV partnered with The Finance Project to embark on one of the largest and most rigorous out-of-school-time (OST) cost studies to date, collecting detailed data from 111 programs that varied dramatically in their focus, content, location, staffing, management and hours of operation.This executive summary highlights the full report's key findings, summarizes variations in program costs and provides recommendations for policymakers and funders who seek to build and sustain quality OST programs for children and youth in their communities.In addition, a companion online cost calculator that provides stakeholders with estimates for various program options is available atwww.wallacefoundation.org/cost-of-quality

Model Based Development of Quality-Aware Software Services

Modelling languages and development frameworks give support for functional and structural description of software architectures. But quality-aware applications require languages which allow expressing QoS as a first-class concept during architecture design and service composition, and to extend existing tools and infrastructures adding support for modelling, evaluating, managing and monitoring QoS aspects. In addition to its functional behaviour and internal structure, the developer of each service must consider the fulfilment of its quality requirements. If the service is flexible, the output quality depends both on input quality and available resources (e.g., amounts of CPU execution time and memory). From the software engineering point of view, modelling of quality-aware requirements and architectures require modelling support for the description of quality concepts, support for the analysis of quality properties (e.g. model checking and consistencies of quality constraints, assembly of quality), tool support for the transition from quality requirements to quality-aware architectures, and from quality-aware architecture to service run-time infrastructures. Quality management in run-time service infrastructures must give support for handling quality concepts dynamically. QoS-aware modeling frameworks and QoS-aware runtime management infrastructures require a common evolution to get their integration