Improving the capacity estimation of a software development team using data

Team capacity is a measurement used to determine how much work a software development team can commit to working on in the future. Teams that use Scaled Agile Framework (SAFe) estimate capacity as a part of the product increment (PI) planning. This study identifies which factors affect the team capacity and how capacity estimations could be improved. Improved accuracy of capacity estimation can result in better predictability in the project. The research was conducted as a case study. First, factors of team capacity were identified from existing literature. Data analysis was conducted on part of the factors to evaluate the impact of the factors in a case company with 12 teams working on a software project. Finally, recommendations on improving team capacity estimations were suggested. Team capacity was seen to be affected by the team's performance and by the team's plans. Based on the research, team performance factors are team availability and size, corrective maintenance, project complexity, production environment, amount of work in progress, and technical debt. The soft factors are team climate, team age and individual competencies. The factors related to the plans' effect on team capacity are the quality of plans and effort estimations done by the team. The relationships between team capacity and team availability, corrective maintenance, and team attributes were studied in the data analysis. The relationship between team availability and team capacity was only visible for two out of 11 teams, while the overall correlation for all teams combined was 0,53. While team capacity estimation in SAFe largely relies on the assumption that team capacity depends on team availability, in the case company, the data of 9 teams did not show this relationship. The central role of team availability in the estimations should be questioned. So far, this has not been done in the field research. Team size was a statistically significant factor for 4 out of 11 teams, making the factor the most apparent one of the analysed factors. For the whole project, team size correlates with team capacity with a negative correlation of -0,29. Corrective maintenance and other team attribute factors were not found to correlate significantly with team capacity. As seen from the results, team capacity is affected by many factors. It cannot be estimated by relying only on the team availability. Team capacity estimations could be improved by improving the estimation process and the related data. Teams should be encouraged to analyse their past more and be trained on what factors affect team capacity. The teams should be provided with data about their past work and capacity estimates from more than one PI. The risk of inaccurate estimations could be lowered by defining capacity estimate explicitly and using a range for the estimate instead of one value. The quality of the historical data used in the capacity estimations could be improved by encouraging teams to document changes in their work and record the realised efforts put into tasks in addition to the estimated efforts

Legal outcomes of all suspected neonaticides in Finland 1980-2000

This nationwide study examined legal outcomes and possible psychiatric diagnoses of suspected cases of neonaticide. Neonaticide is commonly defined as the killing of a newborn on the day of its birth, and is considered to have not only a low prevalence but also a high level of concealed criminality. This hidden nature guided us to find out what the final legal outcomes of suspected neonaticide were. It was a comprehensive, retrospective, register-based study of all 44 cases of suspected neonaticide that occurred 1980-2000 as recorded by Statistics Finland. The 44 cases were ascribed to 40 suspects, three of whom died themselves during the offence. Twelve cases (27%) were eventually prosecuted and the accused convicted of neonaticide. Their mean sentence was 617 days (SD 216, range 300-1095 days). Fourteen offenders (35% of offenders) underwent a forensic psychiatric examination, out of which four (29%) were diagnosed with a psychotic disorder and 10 (71%) with a personality disorder. Six of the 14 women were not sentenced as criminally irresponsible and three of them were committed to involuntary hospital care. Nine cases (20% of cases) were still unsolved, and in eight (18%) cases the offence title had changed into something other than neonaticide. We concluded that since only 41% of suspected neonaticides completed the court process as neonaticides, the previous results from studies on neonaticide may present a subgroup of offenders, not the whole picture. Therefore, further discussion and research is needed to elucidate this perplexing, sad, and utterly redundant offence in modem society, to prevent it, and develop treatment programs for the offenders. (c) 2007 Elsevier Inc. All rights reserved.This nationwide study examined legal outcomes and possible psychiatric diagnoses of suspected cases of neonaticide. Neonaticide is commonly defined as the killing of a newborn on the day of its birth, and is considered to have not only a low prevalence but also a high level of concealed criminality. This hidden nature guided us to find out what the final legal outcomes of suspected neonaticide were. It was a comprehensive, retrospective, register-based study of all 44 cases of suspected neonaticide that occurred 1980-2000 as recorded by Statistics Finland. The 44 cases were ascribed to 40 suspects, three of whom died themselves during the offence. Twelve cases (27%) were eventually prosecuted and the accused convicted of neonaticide. Their mean sentence was 617 days (SD 216, range 300-1095 days). Fourteen offenders (35% of offenders) underwent a forensic psychiatric examination, out of which four (29%) were diagnosed with a psychotic disorder and 10 (71%) with a personality disorder. Six of the 14 women were not sentenced as criminally irresponsible and three of them were committed to involuntary hospital care. Nine cases (20% of cases) were still unsolved, and in eight (18%) cases the offence title had changed into something other than neonaticide. We concluded that since only 41% of suspected neonaticides completed the court process as neonaticides, the previous results from studies on neonaticide may present a subgroup of offenders, not the whole picture. Therefore, further discussion and research is needed to elucidate this perplexing, sad, and utterly redundant offence in modem society, to prevent it, and develop treatment programs for the offenders. (c) 2007 Elsevier Inc. All rights reserved.This nationwide study examined legal outcomes and possible psychiatric diagnoses of suspected cases of neonaticide. Neonaticide is commonly defined as the killing of a newborn on the day of its birth, and is considered to have not only a low prevalence but also a high level of concealed criminality. This hidden nature guided us to find out what the final legal outcomes of suspected neonaticide were. It was a comprehensive, retrospective, register-based study of all 44 cases of suspected neonaticide that occurred 1980-2000 as recorded by Statistics Finland. The 44 cases were ascribed to 40 suspects, three of whom died themselves during the offence. Twelve cases (27%) were eventually prosecuted and the accused convicted of neonaticide. Their mean sentence was 617 days (SD 216, range 300-1095 days). Fourteen offenders (35% of offenders) underwent a forensic psychiatric examination, out of which four (29%) were diagnosed with a psychotic disorder and 10 (71%) with a personality disorder. Six of the 14 women were not sentenced as criminally irresponsible and three of them were committed to involuntary hospital care. Nine cases (20% of cases) were still unsolved, and in eight (18%) cases the offence title had changed into something other than neonaticide. We concluded that since only 41% of suspected neonaticides completed the court process as neonaticides, the previous results from studies on neonaticide may present a subgroup of offenders, not the whole picture. Therefore, further discussion and research is needed to elucidate this perplexing, sad, and utterly redundant offence in modem society, to prevent it, and develop treatment programs for the offenders. (c) 2007 Elsevier Inc. All rights reserved.Peer reviewe

Naisten henkirikollisuus Suomessa : [katsausartikkeli]

Non peer reviewe

Characterisation of candidate members of (136108) Haumea's family: II. Follow-up observations

From a dynamical analysis of the orbital elements of transneptunian objects (TNOs), Ragozzine & Brown reported a list of candidate members of the first collisional family found among this population, associated with (136108) Haumea (a.k.a. 2003 EL61). We aim to distinguish the true members of the Haumea collisional family from interlopers. We search for water ice on their surfaces, which is a common characteristic of the known family members. The properties of the confirmed family are used to constrain the formation mechanism of Haumea, its satellites, and its family. Optical and near-infrared photometry is used to identify water ice. We use in particular the CH4 filter of the Hawk-I instrument at the European Southern Observatory Very Large Telescope as a short H-band (Hs), the (J-Hs) colour being a sensitive measure of the water ice absorption band at 1.6 {\mu}m. Continuing our previous study headed by Snodgrass, we report colours for 8 candidate family members, including near-infrared colours for 5. We confirm one object as a genuine member of the collisional family (2003 UZ117), and reject 5 others. The lack of infrared data for the two remaining objects prevent any conclusion from being drawn. The total number of rejected members is therefore 17. The 11 confirmed members represent only a third of the 36 candidates. The origin of Haumea's family is likely to be related to an impact event. However, a scenario explaining all the peculiarities of Haumea itself and its family remains elusive.Comment: 8 pages, 4 figures, accepted for publication in A&

Transneptunian objects and Centaurs from light curves

We analyze a vast light curve database by obtaining mean rotational properties of the entire sample, determining the spin frequency distribution and comparing those data with a simple model based on hydrostatic equilibrium. For the rotation periods, the mean value obtained is 6.95 h for the whole sample, 6.88 h for the Trans-neptunian objects (TNOs) alone and 6.75 h for the Centaurs. From Maxwellian fits to the rotational frequencies distribution the mean rotation rates are 7.35 h for the entire sample, 7.71 h for the TNOs alone and 8.95 h for the Centaurs. These results are obtained by taking into account the criteria of considering a single-peak light curve for objects with amplitudes lower than 0.15 mag and a double-peak light curve for objects with variability >0.15mag. The best Maxwellian fits were obtained with the threshold between 0.10 and 0.15mag. The mean light-curve amplitude for the entire sample is 0.26 mag, 0.25mag for TNOs only, and 0.26mag for the Centaurs. The amplitude versus Hv correlation clearly indicates that the smaller (and collisionally evolved) objects are more elongated than the bigger ones. From the model results, it appears that hydrostatic equilibrium can explain the statistical results of almost the entire sample, which means hydrostatic equilibrium is probably reached by almost all TNOs in the H range [-1,7]. This implies that for plausible albedos of 0.04 to 0.20, objects with diameters from 300km to even 100km would likely be in equilibrium. Thus, the great majority of objects would qualify as being dwarf planets because they would meet the hydrostatic equilibrium condition. The best model density corresponds to 1100 kg/m3.Comment: 21 pages, 8 figures. Astronomy & Astrophysics, in pres

Atomic layer deposition (ALD) for tin whisker mitigation on Pb-free surfaces

Atomic layer deposition (ALD) for tin whisker mitigation on Pb-free surface

A 1500-year multiproxy record of coastal hypoxia from the northern Baltic Sea indicates unprecedented deoxygenation over the 20th century

The anthropogenically forced expansion of coastal hypoxia is a major environmental problem affecting coastal ecosystems and biogeochemical cycles throughout the world. The Baltic Sea is a semi-enclosed shelf sea whose central deep basins have been highly prone to deoxygenation during its Holocene history, as shown previously by numerous paleoenvironmental studies. However, long-term data on past fluctuations in the intensity of hypoxia in the coastal zone of the Baltic Sea are largely lacking, despite the significant role of these areas in retaining nutrients derived from the catchment. Here we present a 1500-year multiproxy record of near-bottom water redox changes from the coastal zone of the northern Baltic Sea, encompassing the climatic phases of the Medieval Climate Anomaly (MCA), the Little Ice Age (LIA), and the Modern Warm Period (MoWP). Our reconstruction shows that although multicentennial climate variability has modulated the depositional conditions and delivery of organic matter (OM) to the basin the modern aggravation of coastal hypoxia is unprecedented and, in addition to gradual changes in the basin configuration, it must have been forced by excess human-induced nutrient loading. Alongside the anthropogenic nutrient input, the progressive deoxygenation since the beginning of the 1900s was fueled by the combined effects of gradual shoaling of the basin and warming climate, which amplified sediment focusing and increased the vulnerability to hypoxia. Importantly, the eutrophication of coastal waters in our study area began decades earlier than previously thought, leading to a marked aggravation of hypoxia in the 1950s. We find no evidence of similar anthropogenic forcing during the MCA. These results have implications for the assessment of reference conditions for coastal water quality. Furthermore, this study highlights the need for combined use of sedimentological, ichnological, and geochemical proxies in order to robustly reconstruct subtle redox shifts especially in dynamic, non-euxinic coastal settings with strong seasonal contrasts in the bottom water quality.Peer reviewe