Short- and long-term stability in organizational networks: Temporal structures of project teams

Network research focuses on patterns of stable relationships, where stability represents the unfolding of social processes over long time frames. We argue that social interactions exhibit important regularities in different time frames (short and long term), reflecting distinct social processes. We illustrate the value of this distinction through a comparative case study of technology-mediated communication, within two project teams in a digital marketing agency. We examine how the embedding of interpersonal interactions in processes of reciprocity and closure over different time horizons enables the emergence of cohesion in the face of constant compositional changes. We propose that the time frames in which stable patterns of interactions develop are the key to understanding the nature of the underlying social processes with short-term patterns of closure and reciprocity representing adaptation to change while longer term patterns indicate cohesion. Our results are supportive of this argument and show that the two teams exhibit the same regularities in interactions but across different time horizons. We discuss the implication of our findings and argue that distinguishing between short- and long-term stability of social networks offers a novel and promising avenue for network research.     

Salmonella Enteritidis Surveillance by Egg Immunology: Impact of the Sampling Scheme on the Release of Contaminated Table Eggs

Design of surveillance programs to detect infections could benefit from more insight into sampling schemes. We address the effect of sampling schemes for Salmonella Enteritidis surveillance in laying hens. Based on experimental estimates for the transmission rate in flocks, and the characteristics of an egg immunological test, we have simulated outbreaks with various sampling schemes, and with the current boot swab program with a 15‐week sampling interval. Declaring a flock infected based on a single positive egg was not possible because test specificity was too low. Thus, a threshold number of positive eggs was defined to declare a flock infected, and, for small sample sizes, eggs from previous samplings had to be included in a cumulative sample to guarantee a minimum flock level specificity. Effectiveness of surveillance was measured by the proportion of outbreaks detected, and by the number of contaminated table eggs brought on the market. The boot swab program detected 90% of the outbreaks, with 75% fewer contaminated eggs compared to no surveillance, whereas the baseline egg program (30 eggs each 15 weeks) detected 86%, with 73% fewer contaminated eggs. We conclude that a larger sample size results in more detected outbreaks, whereas a smaller sampling interval decreases the number of contaminated eggs. Decreasing sample size and interval simultaneously reduces the number of contaminated eggs, but not indefinitely: the advantage of more frequent sampling is counterbalanced by the cumulative sample including less recently laid eggs. Apparently, optimizing surveillance has its limits when test specificity is taken into account.     

Integrated Approaches for the Public Health Prioritization of Foodborne and Zoonotic Pathogens

To address the persistent problems of foodborne and zoonotic disease, public health officials worldwide face difficult choices about how to best allocate limited resources and target interventions to reduce morbidity and mortality. Data‐driven approaches to informing these decisions have been developed in a number of countries. Integrated comparative frameworks generally share three methodological components: estimating incidence of acute illnesses, chronic sequelae, and mortality; attributing pathogen‐specific illnesses to foods; and calculating integrated measures of disease burden such as cost of illness, willingness to pay, and health‐adjusted life years (HALYs). To discuss the similarities and differences in these approaches, to seek consensus on principles, and to improve international collaboration, the E.U. MED‐VET‐NET and the U.S.‐based Food Safety Research Consortium organized an international conference convened in Berlin, Germany, on July 19–21, 2006. This article draws in part on the deliberations of the conference and discusses general principles, data needs, methodological issues and challenges, and future research needs pertinent to objective data‐driven analyses and their potential use for priority setting of foodborne and zoonotic pathogens in public health policy.     

Reconstructing a Sense of Relational Agency in Family Therapy

The concept of agency is relevant in family therapy. As family therapists we approach each family member as a full agent, which means that what each person thinks and feels, makes sense, and that each person contributes in a significant way to the construction of a relationship. A person's sense of relational agency is constructed in relationships through processes of relational influence. Thus, agency is a relational construct and is dependent on bidirectional transactions in a relationship. A person's sense of relational agency refers to the belief a person has about being able to influence another person, that this influence is significant for the other, makes a difference for the other, and contributes to the construction of the relationship. Many family members who enter therapy have lost their sense of relational agency. In this paper we discuss ideas how to reconstruct family members’ sense of relational agency in therapeutic practice.     

The Effectiveness of Fisher’s Rebuilding Group Intervention on Divorce Adjustment and General Health of Iranian Divorced Women

This research explores the effects of participating in the Rebuilding Seminar on postdivorce adjustment and the general health of divorced women in Arak, Iran. For this quasi-experimental study, 15 participants were recruited through convenience sampling. Prior to the participation in group intervention, participants were asked to complete a demographic questionnaire, the Fisher Divorce Adjustment Scale (FDAS), and the General Health Questionnaire (GHQ–28). Participants then completed the 10 weekly, 2-hour group intervention program. After the completion of the group intervention, postintervention questionnaires were administered. Results indicate that this particular educational program affected adjustment in participants on all subscales of the FDAS, except for social self-worth. The results also suggest that the intervention program was effective on all subscales of the GHQ–28, except for somatic symptoms. Due to numerous changes in the life of divorced women and the stressful nature of divorce, designing and implementing effective intervention plans seems necessary and constructive.     

MODELING DIFFUSION OF MULTIPLE INNOVATIONS VIA MULTILEVEL DIFFUSION CURVES: PAYOLA IN POP MUSIC RADIO

Diffusion curve analysis can estimate whether an innovation spreads endogenously (indicated by a characteristic " s -curve") or exogenously (indicated by a characteristic negative exponential curve). Current techniques for pooling information across multiple innovations require a two-stage analysis. In this paper, we develop multilevel diffusion curve analysis, which is statistically more efficient and allows for more flexible specifications than do existing methods. To substantively illustrate this technique, we use data on bribery in pop radio as an example of exogenous influence on diffusion.     

Parenting in poverty: Perspectives of high-risk parents

Parents considered high risk by child protection services commonly are striving to raise children in poverty but are identified as requiring improved parenting skills. Parent perceptions of their own needs are typically not sought or elicited. This longitudinal study of 35 parents over 18 months garnered 115 in-depth interviews focusing on parent views regarding barriers to effective parenting. Analysis indicated that parents uniformly identified poverty as the primary barrier to their capacity to provide adequate care for their children. Themes elicited indicated that financially parents were living precariously close to margins of defeat. Parents accepted personal responsibility for their economic and parental failings, equating no income with bad parenting. Depression and despair associated with poverty were acknowledged to impair parenting and increase self-doubt about parenting capacity. Experiences with social services generally led to low expectations of parenting assistance. The need for improved aid for impoverished parents is discussed.