Beginning about A.D. 1250, the Zuni area of New Mexico witnessed a massive population aggregation in which the inhabitants of hundreds of widely dispersed villages relocated to a small number of large, architectecturally planned pueblos. Over the next century, 27 of these pueblos were constructed, occupied briefly, and then abandoned. Another dramatic settlement shift occurred about A. D. 1400, when the locus of population moved west to the "Cities of Cibola" discovered by Coronado in 1540. Keith Kintigh demonstrates how changing agricultural strategies and developing mechanisms of social integration contributed to these population shifts. In particular, he argues that occupants of the earliest large pueblos relied on runoff agriculture, but that gradually spring-and river-fed irrigation systems were adopted. Resultant strengthening of the mechanisms of social integration allowed the increased occupational stability of the protohistorical Zuni towns.

Much of the public policy discourse about immigration in the UK has drawn on the experiences of post-war immigrants from the former British colonies. The volume and composition of immigration flows has changed significantly in recent years with substantial increases in the number of immigrants, particularly from countries without links to the UK, and as a result of the large scale immigration from the EU Accession countries in Central and Eastern Europe. Immigration remains a contested issue with public and political debates focusing on the nature and impact of immigration and its perceived negative effects on employment, public services and social cohesion. In spite of the growing number of studies examining the experiences of new immigrants in local neighbourhoods and labour markets there is a lack of comprehensive evidence about how these experiences differ across immigrant groups and the role of place in shaping the experiences and outcomes of new immigration. This research draws on a variety of data from the census, national surveys, administrative sources and qualitative interviews to explore the settlement patterns, labour market outcomes and neighbourhood experiences of new immigrants. The findings show that new immigrants are more likely to locate in ethnically diverse and socially deprived neighbourhoods upon arrival although there is variation in the factors determining immigrant settlement by world area of origin in line with differences in migration motives and entitlements in the UK. The findings from the qualitative interviews highlight the range of motivations and constraints that shape immigrant settlement patterns and how these change over time with secondary migration and family formation. Analysis of the labour market position of immigrants defined by country of origin and ethnicity shows the persistence of ethnic penalties in the labour market. Immigrants from ethnic minority groups both from established and new immigrant groups are found to be more disadvantaged in the labour market than white immigrants and the White British. The neighbourhood context, specifically neighbourhood deprivation and ethnic diversity, is associated with poorer employment outcomes, with the relationship between area deprivation and employment shown to depend on ethnicity. The qualitative evidence highlights the role of social networks and a range of other factors in facilitating and hindering the socio-economic integration of new immigrants. The findings, particularly in relation to immigrant social networks, access to welfare, settlement intentions and housing aspirations, challenge common perceptions about new immigrants living in deprived areas in the UK. The research evidence contributes to a better understanding of the settlement patterns and experiences of new immigration and has implications for national and local policies.

Large open-source software projects involve developers with a wide variety of backgrounds and expertise. Such software projects furthermore include many internal APIs that developers must understand and use properly. According to the intended purpose of these APIs, they are more or less frequently used, and used by developers with more or less expertise. In this paper, we study the impact of usage patterns and developer expertise on the rate of defects occurring in the use of internal APIs. For this preliminary study, we focus on memory management APIs in the Linux kernel, as the use of these has been shown to be highly error prone in previous work. We study defect rates and developer expertise, to consider e.g., whether widely used APIs are more defect prone because they are used by less experienced developers, or whether defects in widely used APIs are more likely to be fixed.

An important characteristic of Service-Oriented Architectures is that clients do not depend on the service implementation's internal assignment of methods to objects. It is perhaps the most important technical characteristic that differentiates them from more common object-oriented solutions. This characteristic makes clients and services malleable, allowing them to be rearranged at run-time as circumstances change. That improvement in malleability is impaired by requiring clients to direct service requests to particular services. Ideally, the clients are totally oblivious to the service structure, as they are to aspect structure in aspect-oriented software. Removing knowledge of a method implementation's location, whether in object or service, requires re-defining the boundary line between programming language and middleware, making clearer specification of dependence on protocols, and bringing the transaction-like concept of failure scopes into language semantics as well. This paper explores consequences and advantages of a transition from object-request brokering to service-request brokering, including the potential to improve our ability to write more parallel software.

Enforcing security policies to distributed systems is difficult, in particular, when a system contains untrusted components. We designed AspectKE*, a distributed AOP language based on a tuple space, to tackle this issue. In AspectKE*, aspects can enforce access control policies that depend on future behavior of running processes. One of the key language features is the predicates and functions that extract results of static program analysis, which are useful for defining security aspects that have to know about future behavior of a program. AspectKE* also provides a novel variable binding mechanism for pointcuts, so that pointcuts can uniformly specify join points based on both static and dynamic information about the program. Our implementation strategy performs fundamental static analysis at load-time, so as to retain runtime overheads minimal. We implemented a compiler for AspectKE*, and demonstrate usefulness of AspectKE* through a security aspect for a distributed chat system.