Empirical study of the effects of open source adoption on software development economics
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1 Empirical study of the effects of open source adoption on software development economics Journal of Systems and Software(2007) Samuel A. Ajila, Di Wu HyeonJeong Kim
2 Contents Introduction Overall approach Population and sampling Hypothesis OSS adoption conceptual model Results analysis Conclusion Discussion 2/21
3 Introduction(1/2) Open source software(oss) is considered for commercial software development Importance of OSS increases Use an existing software system as a base Component adoption can happen at the level of fine granularity Give a rich foundation to reusable software components 3/21
4 Introduction(2/2) Lack in the empirical study of the effects of OSS adoption on development economics In this paper, the objectives empirically investigate the effects OSS components reuse adoption OSS adoption maturity level OSS reuse experience of developers Importance of OSS select criteria Size of the organization 4/21
5 Overall approach Population and sampling methods Hypothesis OSS adoption conceptual model Analysis of the results Getting an approximation of the truth for the formulation of the model, hypotheses, and survey questionnaires Getting a hypothesis between OSS adoption variables and software development economics based on interviews and literature reviews Getting the conceptual model based on the hypothesis Getting the insights on relationships between OSS adoption variance and software development economics 5/21
6 Population and sampling methods(1/3) Initiating the information of OSS adoption Convenience and judgment sampling Random sampling Willing sampling 6 organizations Initial exploratory study from interviews Getting an initial inexpensive approximation of the truth Used in the formulation of research model, hypotheses, and survey questionnaire 120 organizations Questionnaires through to the PM, QM who are involved in OSS adoption projects 60 (among 75) organizations 6/21
7 Population and sampling methods(2/3) Define the measures from the interviews Measure Degree of OSS reuse Maturity level Experience and skill Select criteria Success measures Size of organizations Likert scale is used Description How high was the usage level in several development activities of this project against other projects? What are the maturity levels for reusing OSS components? What is the required level of OSS reuse experience and skill? How important are the OSS components selection criteria for each of the software development activities? How the outcome of the project meets performance goals (budget, productivity, and quality goals)? # of employees, # of developers, annual revenues 7/21
8 Population and sampling methods(3/3) Likert scale is used in questionnaires Form of psychometric response scale Bipolar scaling method used for measuring either positive or negative response to a statement Rating level Not sure Not at all Rarely Moderately Moderately high High Very high Mapping Scale /21
9 Hypothesis Make the hypothesis based on the literature reviews and interviews OSS adoption variables Degree of adoption Software development economics Reuse maturity level Reuse experience and skill Selection criteria for OSS reuse Cost of SW development Productivity of SW development Quality of SW development Control Size of organizations variable 9/21
10 OSS adoption conceptual model Control Hypothesis for each model -> each variable has the positive effects on (a) Budget (b) Productivity (c) Quality Company size has the effects on (a) OSS adoption variables (b) Software development economics H4a Independent Dependent 10/21
11 Result(1/5) Mean and SD for each variable Unit: Likert scale Measures Mean Likert scale SD Degree of adoption Moderately high Motivation level Coordinated Experience and skill Advanced Select criteria 2.8 Important Budget 2.57 Above target Productivity 2.8 Above target Quality 2.77 Above target Company Size 1.5 Medium /21
12 Result(2/5) Normality test for each variable Measures Skewness statistics Kurtosis statistics Degree of adoption Motivation level Experience and skill Select criteria Budget Productivity Quality Company Size All the variables are normally distributed Pearson product-moment correlation coefficient is used for analyzing the relationships between the variables Normalized if value 0 Not normalized if value is larger 12/21
13 Result(3/5) Correlation coefficient and validity of them Measures Degree of adoption 1 2 Maturity level Experience and skill Select criteria Budget Correlation between OSS variables and economics 6 Productivity Quality Company Size Variance extracted Threshold of r Quality is more powerful benefits of OSS than budget and productivity if it between implements OSS adoption in a systematic way and /21
14 Result(4/5) Analysis for H1 model(degree of OSS adoption) Development activities Budget Productivity Quality Software test Core functionality Platform Design pattern Tools Product architecture Documentation Overall adoption Threshold of r between and Degree has positive effects on quality 14/21
15 Result(5/5) Analysis for H5 (size of organizations) Sig. level = 0.01 t-value > Sig. level = 0.05 t-value >1.697 OSS adoption factors Small(N=30) Large(N=30) t-value Mean SD Mean SD Degree of adoption Maturity level Experience and skill Select criteria SW development economics Budget Productivity Quality Small organization has advantages to adopt OSS related to the maturity c KAIST level SE and LAB productivity 2008 It s a test for existing difference according to size 15/21
16 Contribution Conclusion Provide an insight on relationships between OSS adoption factors Degree of adoption, maturity level, developers experience and skill, selection criteria Software development economics Future work Budget, productivity, and quality Impact of OSS reuse should be related to the improved measure of SPI success Need a thorough longitudinal study using the real data 16/21
17 Contribution Discussion(1/5) Structure to get the result from initiating a hypothesis and statistically analyzing the data Critiques Lack of the analysis on the sub-variables included in OSS adoption variables Without consideration on the relationships among OSS adoption variables For example, correlation coefficient between degree and select criteria is /21
18 Discussion(2/5) Steps to construct the simulators Define problem and goal to solve by simulation Do the literature review related to the problem Define the important qualitative parameters and relationship between them Getting the data for quantitatively specifying the parameters and the relationship btw them Construct the simulator and run it Analyze the results and validate it 18/21
19 Discussion(3/5) Required parameters for the simulator Basically, software development economics are required Quantitative information on psychological or detail relationships between parameters are required Example) deadline(schedule pressure) - productivity 19/21
20 Discussion(4/5) Parameter problem to construct the simulator SI companies in Korea rarely collect data Even if they collect the data, its focus is SW development economics Most companies doesn t show the interest on other parameters and doesn t collect data Parameter problem related to data directly connects with validation problem 20/21
21 Self-reflection Discussion(5/5) Getting the quantitative data from the questionnaires is possible way It should be used in the simulator only after proving that the parameter is appropriate through statistics It s demanding work, so it should be done just once Constructing the unbiased questionnaires Selecting the interviewees Collecting and analyzing data 21/21
22 OSS reused maturity levels 22/20
23 AVE(Average Variance Extracted) AVE for correlation efficient r Correlation efficient r is valid if AVE(r) > r 2 Example Var 1 Var 2 Var 3 Var Var Var AVE AVE(r)=0.8 < 0.81 = r 12 2 Var 1 and var 2 have high possibility to measure the same things 23/20
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