Digital Commons Network^™

Classifying Unsolved Murders As Serial Crimes, Rajub Bhowmik

Walden Dissertations and Doctoral Studies

Serial murders have a destabilizing and traumatizing effect on society, making it beneficial for law enforcement to classify certain homicides as serial murders, which would help link cases together and solve all of them. The purpose of this qualitative phenomenological study was to examine which evaluative strategies homicide investigators use to classify unsolved homicides as the work of serial murderers or non-serial homicides. Semistructured interviews were conducted with a population of 10 police professionals. Data were analyzed using NVivo 12 software. Thirteen themes emerged: (a) similar and unusual modus operandi, (b) motive and relation, (c) time period, (d) physical evidences, …

Teacher Perceptions About Teaching Students With Executive Function Deficits, Susan Lynn Dunlap

Walden Dissertations and Doctoral Studies

The problem that prompted this study was that kindergarten through 5th grade teachers were struggling to find appropriate interventions to support the rising number of students exhibiting executive function deficiencies (EFD). The purpose of this qualitative study was to investigate the experiences and perceptions of local elementary teachers about students with EFD, about instructional strategies used to help focus EFD students, and about teachers’ professional needs to work effectively with EFD students. Diamond’s core characteristics of EFD served as the conceptual framework guiding this study. The research questions focused on teachers’ experiences and perceptions of strategies used for students with …

Atheoretical Versus Theory-Based Approaches In Promoting Safer Adhd-Medication Prescribing For Adults, Kathleen A. Fairman

Walden Dissertations and Doctoral Studies

Gaps between treatment guidelines and medical decisions persist despite interventions with physicians, which are mostly atheoretical. The purpose of this retrospective cross-sectional study was to compare atheoretical and theory-based logistic regression models of a binary outcome: potentially unsafe prescribing of attention-deficit hyperactivity disorder (ADHD) medications to adults. Social cognitive theory and self-determination theory provided the framework for the study. Predictors were framed as social cognitive theoretical constructs: knowledge (e.g., physician specialty) and environmental influence (e.g., interventions). Atheoretical hypotheses were based on legislation mandating meaningful use of electronic health records and computerized decision support (CDS). Theory-based hypotheses were derived from literature …

Aviation Maintenance Technician Decision-Making, Dominic Hemingway

Walden Dissertations and Doctoral Studies

Aircraft accidents caused by human decision-making errors cause property loss and fatalities on a global scale in the aviation industry. Aviation repair technician decision-making perceptions influence aviation safety. The purpose of transcendental phenomenological study was to explore the lived experiences of aviation repair technicians related to decision-making perceptions regarding aviation safety. The central research question and sub-question focused on the lived experiences of repair technicians’ decision-making perceptions. The naturalistic decision-making framework, decision theories, and decision-making models comprised the lens to assess the impact of aviation maintenance technician decision-making perceptions in aviation safety. Data were collected using semistructured interviews with 12 …

Strategies For Improving Remedial Mathematics Performance Among Community College Students, Lateria S. Joiner

Walden Dissertations and Doctoral Studies

Increasing numbers of underprepared students throughout the United States must enroll in college remedial math courses, which delays students’ graduation and increases withdrawal rates. Two-thirds of first-year college students at a rural community college in the southeastern United States were required to enroll in remedial mathematics. Only 65% completed the course. Guided by Bandura’s theory of self-efficacy, which maintains that belief in one’s ability improves success, the purpose of this qualitative study was to examine the perceptions of instructors, administrators, and students to explain the gap in performance in remedial mathematics and to use the results of this study to …

Exploring Strategies For Recruiting And Retaining Diverse Cybersecurity Professionals, Vivian Lyon

Walden Dissertations and Doctoral Studies

The cyber threat landscape has led some cybersecurity leaders to focus on a holistic approach encompassing people, processes, and technology to make their government agencies and organizations more responsive to a more diverse and inclusive cyber workforce to protect critical infrastructure from hackers or cybercriminals intent on causing harm. This qualitative multiple case study used Schein’s organizational culture theory to explore strategies used by cybersecurity leaders to attract, recruit, and retain diverse cybersecurity professionals to effectively and efficiently protect sensitive systems from rising cyber threats. The study's population consisted of cybersecurity leaders from 3 government agencies and 9 organizations in …

Microcystins And Liver Disease Mortality, Insights From An Ecological Study, Rajesh Tirpaul Melaram

Walden Dissertations and Doctoral Studies

Microcystins (MCs) are toxic secondary metabolites produced by freshwater cyanobacteria. Algal bloom subsidence can stimulate MC release, which can impair liver function if orally exposed to in large doses. The purpose of this retrospective, U.S. ecological study was to determine if MC exposure represented an environmental risk factor for liver disease mortality using a socioecological approach. A longitudinal ecological substudy investigated the association between average total MCs in Lake Washington and Lake Manatee and age-adjusted chronic liver disease (CLD)/cirrhosis death rates in Brevard County and Manatee County, Florida (FL). A prediction model of total MCs was deduced by quantifying levels …

Green Innovative Strategies Construction Business Leaders Implement To Increase Organizational Performance, Janelle Sharee O'Mard

Walden Dissertations and Doctoral Studies

The construction industry lacks innovative green strategies to increase organizational performance. However, construction business leaders are hesitant to implement innovative green strategies due to the possibility of decreased organizational performance. Grounded in Fiedler’s contingency theory, the purpose of this qualitative multiple case study was to explore the innovative green strategies implemented by construction business leaders to increase organizational performance. Data were collected from semistructured interviews and company documents with 5 construction business leaders in Antigua who successfully used innovative green strategies to increase organizational performance. Data were analyzed using Yin’s 5-step process. Five themes emerged: innovative research and design, collaboration, …

Strategies For The Development Of It Disaster Recovery Plans In The Manufacturing Industry, Michael Landry Sartwell

Walden Dissertations and Doctoral Studies

Information technology (IT) leaders have reported technology disruptions because of natural disasters, terror attacks, or adversarial threats. Information technology leaders are concerned with technology disruptions, as these disruptions are costing organizations as much as $22,000 per minute. Grounded in Zachman’s framework, the purpose of this qualitative multiple case study was to explore strategies IT managers in the manufacturing industry use to develop IT disaster recovery (DR) plans to support business operations. The participants included 3 manufacturing IT professionals, 2 Department of Defense manufacturing infrastructure specialists, and 1outsourcing contractor, each from firms located in the central United States who successfully developed …

Factors Influencing Cloud Computing Adoption By Small Firms In The Payment Card Industry, Marie Njanje Tambe

Walden Dissertations and Doctoral Studies

Technology acceptance is increasingly gaining attention in research considering the continuous exploits of innovation and various derived advantages. Cloud computing (CC) has shown to be the ideal solution for aligning information technology with business strategies. However, small to medium-sized enterprises (SMEs) in the payment card industry are reluctantly adopting this technology despite the benefits. This correlational study aims at investigating whether security, cost effectiveness, or regulatory compliance influence CC adoption by U.S. SMEs in the payment card sector. The study builds on the technology-organization-environment (TOE) framework and uses a previously validated instrument to assess CC adoption by decision-makers in U.S. …

Middle Level Teachers’ Perceptions Of Quality Professional Development, Justin Turner

Walden Dissertations and Doctoral Studies

Professional development is a learning process that continues throughout the career of an educator providing opportunities for teachers to fine tune their teaching and improve classroom practices. The middle level teachers at Middle School A believe they are lacking in effective professional development. The purpose of the project study was to determine what the perceptions of middle level teachers are regarding effective professional development. The ability for teachers to transfer their learning into the classroom is vital to the success of the students at this Central Ohio middle school. Mezirow’s transformative learning theory of adult learning, which states that adults …

Instructors’ Perceptions Of Differentiated Instruction At Four Universities In The United States, Brandy Waldron

Walden Dissertations and Doctoral Studies

According to a 2015-2016 fall term end-of-course survey at a university in the southern United States, differentiated instruction (DI) was minimal and student participants reported that they may have performed better on coursework if given a variety of learning options. The purpose of this study was to determine how instructors at 4 U.S. universities perceive use of DI and their ideas about the necessary tools and strategies to practice it. Research needed to be conducted so instructors could successfully meet the diverse needs of students by having the necessary tools to practice differentiation. Tomlinson’s theory that focuses on the need …

Trends And Barriers Regarding Attrition Among Adult Learners At A Community College, Myrtle C. Brown

Walden Dissertations and Doctoral Studies

The high attrition rates of adult learners at a 2-year, southeastern community college are a continuing concern among college administrators. These high rates have resulted in an increased number of nontraditional adult learners failing to persist and complete a program of study. Poor persistence and noncompletion of a degree create budgetary loss and reduced revenue critical to the support of the college’s use of resources and services to students. The purpose of this qualitative case study was to explore nontraditional adult learners’ perspectives of their college experiences and the influences, challenges, and barriers that prohibited their degree completion. Tinto’s student …

Developing Cloud Computing Infrastructures In Developing Countries In Asia, Daryoush Charmsaz Moghaddam

Walden Dissertations and Doctoral Studies

Developing Cloud Computing Infrastructures in Developing Countries in Asia

by

Daryoush Charmsaz Moghaddam

MS, Sharif University, 2005

BS, Civil Aviation Higher Education Complex, 1985

Doctoral Study Submitted in Partial Fulfillment

of the Requirements for the Degree of

Doctor of Information Technology

Walden University

March 2020

Exploring Software Testing Strategies Used On Software Applications In The Government, Angel Diane Cross

Walden Dissertations and Doctoral Studies

Developing a defect-free software application is a challenging task. Despite many years of experience, the intense development of reliable software remains a challenge. For this reason, software defects identified at the end of the testing phase are more expensive than those detected sooner. The purpose of this multiple case study is to explore the testing strategies software developers use to ensure the reliability of software applications in the government contracting industry. The target population consisted of software developers from 3 government contracting organizations located along the East Coast region of the United States. Lehman’s laws of software evolution was the …

Interventions To Address Teacher Attrition From Low-Income Schools, Kenneth Bradley Darnell

Walden Dissertations and Doctoral Studies

The research problem was teacher turnover from low-income K–12 schools to higher-income K–12 schools. This problem is important because of the negative effects on student learning and the high cost of replacing departed teachers. The purpose of this basic qualitative study was to describe how low-income schools can implement interventions that will positively address the challenges teachers face that lead to teacher attrition through the support of administration, parental support, coworker relationships, and safety as perceived by teachers who formerly taught in low-income schools. The conceptual framework for this study was human capital theory. The participants were 56 K–12 teachers …

Financial Management Strategies Used By Microbusiness Leaders, Dorothy M. David

Walden Dissertations and Doctoral Studies

Small and medium-sized microbusinesses accounted for the majority of net new jobs in the United States between 2000 and 2018. Yet a high percent of microbusinesses have exited the market due to business failure. The applicability of the findings from this study may positively influence small business owners seeking strategies that enable small business success. Grounded in entrepreneurship theory, the purpose of this qualitative multiple-case study was to explore financial management strategies microbusiness leaders use to sustain their business success beyond 5 years. The participants comprised 3 small business owners in Virginia with sustained businesses beyond 5 years. Data were …

Comparison Of Diagnosis And Hospital Referral Rates Between Physician And Non-Physician Practitioners, Joshua Alan Fisher

Walden Dissertations and Doctoral Studies

Physician extenders as support in healthcare facilities has been increasing in the United States and has the potential to help in currently under served communities. This study evaluated the quality of care provided by physician extenders through the examination of average diagnosis and referral rates that may inform healthcare leaders and policymakers in future decisions. The literature review pointed to a gap in the research related to the quality of care based on patient diagnosis and referral rates by physicians and physician extenders. The conclusions were based on a quantitative analysis of secondary data from the National Ambulatory Medical Care …

Succession Planning Strategies For Retiring Employees In The Department Of Defense, Danielle Mccullough

Walden Dissertations and Doctoral Studies

In 2017, more than 18% of the workforce in the Department of Defense (DoD) was eligible to retire. Employee retirement continues to present a persistent shortage of DoD knowledge workers, especially in security protections. The purpose of this qualitative single case study within a DoD intelligence agency was to explore succession planning strategies that DoD managers use to ensure knowledge possessed by retirees was transitioned to incumbent knowledge workers. The conceptual frameworks for this study were the 7-pointed star model for succession planning and the 4 pillars of knowledge management. The population was DoD managers from STEM and cyber intelligence …

Meat Intake And Prostate Cancer In African American Men, Uchenna Njoku

Walden Dissertations and Doctoral Studies

African American men have more prostate cancer and are more than twice as likely to die of the disease as Caucasian men, and the reasons for this racial disparity have not been clarified. Identifying lifestyle and dietary risk factors of prostate cancer is an important public health issue. Studies on the association between meat intake and prostate cancer risk have produced inconsistent results. The purpose of this cross-sectional quantitative study was to determine whether there is an association between total meat intake and total prostate cancer risk among African American men when controlling for age, income, educational level, physical activity, …

The Relationship Between Professional Development, Instruction, And Student Achievement In Elementary Mathematics, Linsey Sims

Walden Dissertations and Doctoral Studies

Many school districts acknowledge professional development (PD) as an approach that can change teaching practices and improve student achievement. Because elementary teachers often struggle to provide instruction for mathematical proficiency, the purpose of this quantitative study was to examine the strength of the relationships among teacher participation in math PD courses, Texas Teacher Evaluation and Support System (T-TESS) implementation scores, and student achievement. The theoretical framework for the study is based on Guskey’s model of teacher change. The research questions pertained to the strength of the relationship between the following pairs of variables: (a) teacher participation in math PD and …

Strategies To Lower Security Risks Involving Medical Devices In Patient Care, Brittany Latonia Thigpen

Walden Dissertations and Doctoral Studies

Insufficient security and design strategies used during the analysis phase of medical device software development can lead to possible cybersecurity vulnerabilities with patient data. The purpose of this qualitative exploratory multiple case study was to explore strategies software developers use to implement security measures to protect patient information collected, sent, and stored by medical devices. The population for this study included software developers whose primary focus was on the security aspect of medical software in three software companies in the Baton Rouge, LA, area. The data collection process included semistructured interviews with 10 software developers and reviewing 16 organizational documents. …

Risk Assessment Strategies To Reduce Profitability Losses From Pipeline Accidents In The Natural Gas Industry, Cynthia Hurdle

Walden Dissertations and Doctoral Studies

Ineffective risk assessment strategies can negatively impact the natural gas industry.

Engineer project managers who struggle to maintain a risk assessment plan are at high risk of failure, which could result in devastating consequences for the business and environment. Grounded in the theory of risk assessment, the purpose of this qualitative single case study was to explore strategies engineer project managers in the natural gas industry use to improve risk assessment planning to reduce pipeline accidents and improve profitability. The participants comprised of 5 engineer project managers in Virginia, who effectively use risk assessment strategies to promote safety metrics and …

The Way Forward For The Integration Of Sustainability Standards, Tobi Petrocelli

Walden Dissertations and Doctoral Studies

Large-scale environmental failures within public companies in the United States have led to a globally growing trend in stakeholder insistence that company leaders maintain formal integrated sustainability accounting in their financial reports. Companies that rate high on communications of their sustainability efforts and integrating corporate social responsibility develop investment efficiency and ultimately increase their financial performance. Grounded in stakeholder theory, the purpose of this qualitative multiple case study was to explore strategies 5 chief sustainability officers within publicly held companies in New York can integrate into their annual reporting in order to generate maximum value for stakeholders. Data were collected …

Differentiating Instruction To Prepare African American Males For High School Accelerated Courses, Monique Carson

Walden Dissertations and Doctoral Studies

Differentiating instruction is important in helping students with diverse backgrounds and learning styles understand curricula; however, this can be challenging for educators. The educators at the study site reported that teachers’ instructional practices could be affecting African American males’ preparedness for accelerated courses. The purpose of this qualitative case study was to examine how rigorous, differentiated instructional practices were being used in the classroom to prepare African American male students for accelerated courses at an urban, Title I school in the Southwest United States. The study was guided by Tomlinson’s differentiated instruction framework. Research questions addressed the types of instructional …

After-School Enrichment Programs And Secondary Education Achievement Among African American Males, Willis Roger Carter

Walden Dissertations and Doctoral Studies

The purpose of this single case study, at one high school in the Midwest region of United States, was to examine after-school enrichment programs and their connections to improving academic achievement for African American (AA) male students. The central question of what factors in structured after-school enrichment programs (ASEPs) contribute to academic achievement for AA males was studied using social learning theory and punctuated equilibrium as the theoretical guide. Data were collected via face-to-face interviews and surveys administered to 10 administrators, 10 parents, and 10 teachers who met the criteria for inclusion in the study. Data collection also included classroom …

The Effects Of Problem-Based Learning On The Academic Achievement Of Elementary Students And Teacher Perception, Eva Marie Cwynar

Walden Dissertations and Doctoral Studies

As a result of a district’s initiative to change educational practices, schools in the local setting were considering the problem-based learning (PBL) constructivist model as a way of increasing student achievement. The problem was that it was unknown to what extent PBL was being used in the classroom and how its use correlated with student achievement. The purpose of this sequential mixed methods study was to determine the correlation between teachers’ reported degree of PBL implementation and the academic achievement of their students on the ELA assessment and to explore teachers’ experiences when implementing PBL. The study took place in …

Talent Retention Strategies For Service Industry Managers Within Rust Belts, Tunisha Foley

Walden Dissertations and Doctoral Studies

Human capital flight jeopardizes the future of rust belt organizations. Service industry managers within rust belt cities are at high risk of failure. Framed by the talent management model, the purpose of this qualitative multiple case study was to explore strategies rust belt managers used to reduce human capital flight. Participants were 1 health care manager and 1 social assistance manager from Detroit, Michigan, and Flint, Michigan, respectively, who successfully implemented strategies to reduce human capital flight. Data were collected from semistructured interviews and business documents. Data were analyzed with inductive content analysis, word frequency searches, and theme interpretation. Three …

Prekindergarten Practitioners’ Perspectives Of The Creative Curriculum For At-Risk Students, Navine Fortune

Walden Dissertations and Doctoral Studies

Investigators have addressed elementary practitioners’ perspectives concerning the concept of curriculum development and children’s learning; however, much less information is available on prekindergarten practitioners’ perspectives of curriculum for at-risk prekindergarten students. This basic qualitative study explored prekindergarten practitioners’ perspectives of self-efficacy, competence, and motivation in the implementation of The Creative Curriculum for Preschool Program with at-risk students in a southeastern state. The theories of constructivism and self-efficacy guided the conceptual framework for this study. The research questions focused on prekindergarten practitioners’ perspectives of self-efficacy, competency, and motivation during implementation of the curriculum. Data were collected using in-depth semistructured interviews with …

Middle-School Mathematics Teachers' Use Of Formative Assessment Data, Shawana T. Green

Walden Dissertations and Doctoral Studies

A school district located in the southeastern United States uses benchmark tests as formative assessment to provide teachers with data to differentiate their instruction to meet the individual needs of students in their classrooms. Despite this effort, student achievement in mathematics in this school district has not improved. The purpose of this study was to gain an understanding of how middle-grade mathematics teachers used the benchmark results as formative data to guide instruction and meet student needs. The conceptual framework that grounded this study was the model of formative assessment developed by Black and Wiliam. For this basic qualitative study, …