Quick Look
Grade Level: 11 (1112)
Time Required: 5 hours
(six 50minute sessions; this project is intended for the last six weeks of AP Statistics; see the AP Statistics topics and timing note for more details)
Expendable Cost/Group: US $0.00
This activity requires the use of some nonexpendable (reusable) items such as calculators, computers and software; see the Materials List for details.
Group Size: 3
Activity Dependency:
Subject Areas: Data Analysis and Probability, Science and Technology
Summary
Students apply prerequisite statistics knowledge and concepts learned in an associated lesson to a realworld stateoftheart research problem that asks them to quantitatively analyze the effectiveness of different cracked steel repair methods. As if they are civil engineers, students statistically analyze and compare 12 sets of experimental data from seven research centers around the world using measurements of central tendency, fivenumber summaries, boxandwhisker plots and bar graphs. The data consists of the results from carbonfiberreinforced polymer patched and unpatched cracked steel specimens tested under the same stress conditions. Based on their findings, students determine the most effective cracked steel repair method, create a report, and present their results, conclusions and recommended methods to the class as if they were presenting to the mayor and city council. This activity and its associated lesson are suitable for use during the last six weeks of the AP Statistics course; see the topics and timing note for details.Engineering Connection
The maintenance and repair of civil infrastructure is an important task for governments around the world, and it is critical to get it right. Structural failure can have mortal, disastrous consequences, such as the I35 bridge collapse in Minneapolis (see Figure 1) and the Alexander Kielland Norwegian North Sea rig disaster. Engineers continue to devise alternative repair methods that are more efficient, easier to perform, and less expensive than traditional methods. Composites with strength and durability similar or superior to that of steel have been successfully used to rehabilitate infrastructures. Carbonfiberreinforced polymers (CFRP) and epoxy adhesive patches are good solutions to stop crack propagation and extend the mean fatigue life of steel; they are also easy to apply and do not corrode, modify or overload the structure (see Figure 2). With the design of CFRP, engineers have provided a material that is as strong as steel, but lighter, corrosion resistant and simple to work with. Through this activity, students see and experience a realworld applied use for statistical analysis.
Learning Objectives
After this activity, students should be able to:
 Use boxandwhisker plots to analyze various data sets.
 Use bar graphs to compare and make conclusions about multiple data sets.
 Use technology to efficiently perform statistical analyses and graph data.
 Use PowerPoint® to present results and conclusions.
 Describe the statistical analyses performed on experimental data.
 Clearly state final conclusions resulting from statistical analyses.
Educational Standards
Each TeachEngineering lesson or activity is correlated to one or more K12 science,
technology, engineering or math (STEM) educational standards.
All 100,000+ K12 STEM standards covered in TeachEngineering are collected, maintained and packaged by the Achievement Standards Network (ASN),
a project of D2L (www.achievementstandards.org).
In the ASN, standards are hierarchically structured: first by source; e.g., by state; within source by type; e.g., science or mathematics;
within type by subtype, then by grade, etc.
Each TeachEngineering lesson or activity is correlated to one or more K12 science, technology, engineering or math (STEM) educational standards.
All 100,000+ K12 STEM standards covered in TeachEngineering are collected, maintained and packaged by the Achievement Standards Network (ASN), a project of D2L (www.achievementstandards.org).
In the ASN, standards are hierarchically structured: first by source; e.g., by state; within source by type; e.g., science or mathematics; within type by subtype, then by grade, etc.
NGSS: Next Generation Science Standards  Science

Analyze data using computational models in order to make valid and reliable scientific claims.
(Grades 9  12 )
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Analyze data using tools, technologies, and/or models (e.g., computational, mathematical) in order to make valid and reliable scientific claims or determine an optimal design solution.
(Grades 9  12 )
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Apply concepts of statistics and probability (including determining function fits to data, slope, intercept, and correlation coefficient for linear fits) to scientific and engineering questions and problems, using digital tools when feasible.
(Grades 9  12 )
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Common Core State Standards  Math

Represent data with plots on the real number line (dot plots, histograms, and box plots).
(Grades 9  12 )
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Use statistics appropriate to the shape of the data distribution to compare center (median, mean) and spread (interquartile range, standard deviation) of two or more different data sets.
(Grades 9  12 )
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Interpret differences in shape, center, and spread in the context of the data sets, accounting for possible effects of extreme data points (outliers).
(Grades 9  12 )
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State Standards
Texas  Math

apply mathematics to problems arising in everyday life, society, and the workplace;
(Grade
9 )
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Mathematical process standards. The student uses mathematical processes to acquire and demonstrate mathematical understanding. The student is expected to:
(Grades
9 
12 )
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communicate methods used, analyses conducted, and conclusions drawn for a dataanalysis project through the use of one or more of the following: a written report, a visual display, an oral report, or a multimedia presentation; and
(Grades
9 
12 )
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Materials List
Each student needs:
 graphing calculator (TINspire™ recommended)*
 USB 2.0 highspeed A to miniB cable*
 TINspire™ Computer Link Software; for Windows (exe) or Macintosh (dmb); download here
 PC computer loaded with Microsoft® Excel® and PowerPoint® software
 PreActivity Test, one per person
 Project Guidelines and Rubrics, one per person
 Experimental Data Sets (PDF or Word® file), one per person
 Experimental Data Sets (Excel® file), one per student (only for students if using the TINspire™ CX Student Software)
*An optional alternative to the graphing calculator and USB connector cable is to use a computer with the TINspire™ CX Student Software.
To share with the entire class:
 (optional) projector and computer/laptop to display to the class the Activity Intro Presentation (a PowerPoint® file) and Experimental Data Set (an Excel® file) during the activity introduction
 (optional) the hardware and software tools to create videos (instead of final slide presentations)
Worksheets and Attachments
Visit [www.teachengineering.org/activities/view/uoh_carbonfiber_lesson01_activity1] to print or download.More Curriculum Like This
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PreReq Knowledge
This activity is designed for students taking AP Statistics. Students should be familiar with:
 Central tendency measurements, including mean, median and mode
 Fivenumber summary
 Standard deviation and coefficient of variation
 Boxandwhisker plots, simple and clustered bar graphs, and Pareto charts
Students should also have basic computer skills and be familiar with Microsoft® Excel® and PowerPoint®, and graphing calculators.
Teach students the associated lesson to help them understand the context of the data to be analyzed.
Introduction/Motivation
Rehabilitation of cracked steel structures is an important and challenging task. Improving the resiliency, extending the life, and maintaining the integrity of civil infrastructure is a necessary priority for governments around the globe because structural failures can have fatal consequences. In the associated lesson, we learned about the collapse of the Minneapolis I35W Bridge over the Mississippi River and the Norwegian North Sea Alexander Kielland platform—both human disasters that are examples of the lifeprotecting professional responsibility of civil engineers to design and maintain safe structures.
Visualize yourselves as civil engineers working for our city’s Department of Public Works and Engineering. Your responsibility is the operation, maintenance, construction management, and technical engineering of the city's public infrastructure. One of your duties is the periodic inspection of the city’s steel support structures and their corresponding repair as soon as any fracture or cracking is detected.
Because of your expertise, you are invited to participate in a meeting with the mayor and city council. One discussion point is the new budget for repair of the city’s civil infrastructure. One council member expressed concern about the cost and effectiveness of the traditional repair methods used by the city. The council member is concerned that the current methods that require modification of the original structure, such as drilling holes, may compromise the structures’ reliability over time. The city council and mayor have asked you to find a new or different repair method that does not alter the original structures.
So that you are datadriven in your recommendations, you decide to conduct an analysis of repair methods developed in seven civil engineering research centers around the world: University of Massachusetts (USA), Southwest Jaiton University (China), National Technical University of Athens (Greece), Technical University of Denmark, Monash University (Australia), ABC Politecnico di Milano (Italy), and the University of Houston (USA). Based on the findings from your statistical analysis, you will select the most efficient method and then present your results, evidencebased conclusions and recommendation to the mayor and city council.
Procedure
Background
In this activity, students’ engineering challenge is to analyze 12 data sets of experimental results from seven research centers to determine the best patching method to rehabilitate steel structures. To help them make sense of the data, first teach the associated lesson to give them a basic and broad understanding of composites, fiberreinforced polymers, carbon fiber, epoxy adhesives, nitinol, and repair patches. The activity data analysis requires students to determine for each data set: mean (mean fatigue life), standard deviation, coefficient of variation, trimmed mean, the fivenumber summary and the associated boxandwhisker plot. Students must also compute the relative efficiency and relative median efficiency (reported as percentages) of each patching method. The relative efficiency E_{R} is defined as:
The relative median efficiency E_{M} is defined as: Students compare the relative efficiencies using a bar graph and a Pareto chart. Finally, the student teams are asked to summarize the analysis they performed, and share their results and conclusions in a professional slide presentation (or video) to the rest of the class.Suggested Activity Schedule
The estimated time to perform this data analysis activity is six 50minute sessions for a threemember team “workinginparallel.” (Larger teams “workinginparallel” can reduced this time; a fourmember team may work four data sets per day, and finish the data analysis in four days). The suggested work flow:
Day 1: (50 minutes)
 University of Massachusetts. Data Sets 1 and 2
 Southwest Jiaotong University. Data Set 3
Day 2: (50 minutes)
 Southwest Jiaotong University. Data Set 4
 National Technical University of Athens. Data Set 5
 Technical University of Denmark. Data Set 6
Day 3: (50 minutes)
 Technical University of Denmark. Data Set 7
 Monash University. Data Sets 8 and 9
Day 4: (50 minutes)
 ABC Politecnico di Milano. Data Sets 10 and 11
 University of Houston. Data Set 12
Day 5: Relative efficiencies analysis; bar graph and Pareto chart (50 minutes)
Day 6: Group presentations (estimated 50 minutes; time may vary, depending on class size and presentation expectations)
Before the Activity
 Gather materials and make copies of the PreActivity Test, Project Guidelines and Rubrics, and Experimental Data Sets. Each student needs a graphing calculator, cable, hardcopy of the data sets, and computer OR computer, software and Excel® data file, so that students can simultaneously crunch numbers as a group.
 Alternative setup: If the TINspire™ CX Student Software is available on the student computers, it can be used for all computations and graphs instead the handheld calculators, thereby avoiding the necessity to transfer files between the calculators and PCs. In this case:
 Make sure that you are familiar with the TINspire™ CX Student Software.
 Transfer the Experimental Data Sets (the Excel^{®} file) to the student computers.
 Prepare computers for each student, with Excel^{®}, PowerPoint^{®} and TINspire™ Computer Link Software installed, so that teams are able to work in parallel.
 So that you are prepared to model the steps for students (if needed), it is recommended that teachers perform (at least some of) the computations, data analysis, graphs, connectivity, and file transfers with the TINspire™ Computer Link Software that students will be required to do.
 (optional) Prepare an example data set (somewhat like the 12 data sets) to use during the procedure (step 7, below) to explain and demonstrate (if needed) what students need to do for each of the 12 data sets.
 (optional) Prepare to display to the entire class the Activity Intro Presentation (a PowerPoint^{®} file) and the Experimental Data Sets (the Excel® file). Note: The slides are “animated,” so run the file as a slide show and click to bring up the next item.
With the Students
 Administer the preactivity test. Check students’ answers to verify their understanding of the foundational statistical analysis concepts necessary to succeed in the activity.
 Present to the class the Introduction/Motivation section content, which introduces the hypothetical engineering challenge—a realworld applied use for statistical analysis. (optional) Use the nineslide presentation to provide visuals for the class as you introduce the activity components in more detail. Topics covered: the engineering challenge, information on data analysis, graphing and fatigue life ratio, and final presentation main components.
 Pass out the guidelines/rubrics handout, which describes the engineering challenge and provides project guidelines in an overview format to guide students through the entire project.
 Let students set up work teams of three members each. Advise students that in order to finish the analysis of all the data sets in the allotted time each day (3 sets in 50 minutes), they need to “work in parallel,” that is, have each group member simultaneously perform one analysis.
 Explain to the student teams that:
 Their task is to analyze 12 different data sets coming from seven different research centers.
 The data consists of the results of CFRP patched and unpatched cracked steel specimens, tested under the same stress conditions.
 Every research center set up different experimental conditions.
 Every record in each data set is the maximum number of times the tested patched or unpatched specimens resisted the constant and periodic stress applied, that is, the number of times (cycles) the stress was applied before the specimens broke.
 Project the data sets spreadsheet and flip through the different tabs to show the class how it is organized. Explain that the number of records in each column is the number of specimens tested.
 Using one of the data sets (or a similar example data set created you created in advance) explain (or demonstrate, if needed) what students need to do for each of the 12 data sets:
A. Compute mean and standard deviation. The means represent the mean fatigue life for the patched and unpatched tested sets, and the standard deviations are the average spread of the individual fatigue lives around their mean values. The standard deviation gives a first measurement for the variability of the effectiveness of the patching method.
B. Calculate coefficient of variation. This compares the variability of the effectiveness of the patching method with the extended fatigue life achieved by the patched specimens.
C. Find the fivenumber summary. These numbers quantify the overall variability or range of the results, provide the median fatigue life of the specimens, the symmetric or nonsymmetric distribution of the data, and display any anomalous performance values or outliers that could be discarded in the final analysis.
D. 10% trimmed mean. This gives an alternative value for the mean fatigue life, computed after the largest and/or smallest anomalous test results are discarded. For data sets with large and/or small outliers, this alternative average could give a more representative mean fatigue life value.
E. Relative efficiencies. These values measure the extended mean fatigue life and extended median fatigue life of the patched versus unpatched specimens (E_{R} and E_{M}, respectively). The values represent the number of times the patching repair method extended the mean and median fatigue lives of cracked specimens.
F. Boxandwhisker plots. For every one of the 12 data sets, display the graph of fivenumber summaries obtained for the patched and unpatched records in the same graphing window. This can be easily done using graphing calculator capabilities. In every one of the 12 generated graphs, require students to also include a line representing the mean fatigue life of the patched and unpatched specimens.
G. Statistics and graphs analysis. To conclude, do a brief and concise analysis of all the previous information and of the boxandwhisker plots obtained, as well your conclusion as to the effectiveness of the repair used.
 Have students display their results from the AG analysis in a table format in Word® or Excel®, which makes it convenient to incorporate it in their final results presentations. Suggest (or require) that students use a format like that used one in the Experimental Data Analysis Answer Key.
 If using graphing calculators, inform students that all of the required data analyses can be performed using the graphing calculators. Explain that they will need to manually load the data sets into the calculators, and since few values need to be typed in, it can be done quickly. Remind students to doublecheck that they have typed in the data correctly. If the TINspire™ CX Student Software is available, copy/paste the data from the Excel® data sets file, and perform all the above calculations using this software on the PCs, avoiding the file transfer process.
 Have students transfer the boxandwhisker plots from their calculators to the PCs using the TINspire™ Computer Link Software and the USB cable. Remind students to include these graphs in their results presentations.
 Once all the above tasks are done, direct groups to each create an Excel® table with the relative efficiencies (E_{R} and E_{M}) obtained for each of the 12 data sets that specifies the research center the efficiencies came from (see the Relative Efficiencies Analysis section starting on page 17 of the Experimental Data Analysis Answer Key). This table provides the necessary information to create (using Excel®) a relative efficiencies clustered bar graph and its associated Pareto chart for E_{R}, which are graphs that help to visually determine the most efficient patching repair method.
 Tell students that once they have completed the data analyses, it is time to create reports and presentations of their results. Use the rubric to outline expectations that work with the class time available to devote to group presentations. Require reports to include: project background, data analyzed, obtained results and related graphs, and the corresponding statistical analysis and conclusions; refer students to the rubric for details.
Vocabulary/Definitions
bar graph: A graphical display of grouped statistical data presented in the form of rectangular bars. The independent variable values are discrete, while the dependent variable values (indicated by rectangle length) may be discrete or continuous. Also called a bar chart.
boxandwhisker plot: A graphical display of the fivenumber summary.
coefficient of variation: The ratio of the standard deviation to the mean, multiplied times 100 and reported as a percentage.
fivenumber summary: A descriptive statistic that includes 1) the minimum value, 2) the lower or first quartile, 3) the median or second quartile (middle value), 4) the upper or third quartile, and 5) the maximum value.
interquartile range: A measure of variability. The difference between the third and first quartiles.
mean: The average of a set of numbers; the sum of the numbers, divided by the total count of numbers.
median: The “middle” number from a sorted list of numbers.
percentile: A defined value such that a percentage (X%) of the data fall at or below it, and (100X%) of the data fall at or above it.
quartile: The percentile that divides a data set into four equal groups (quarters).
range (statistics): The difference between the highest and lowest values in a data set.
standard deviation: A measure of how spread out a set of numbers is around its mean.
trimmed mean: An averaging method that reduces the effects of statistical outliers; the mean of the values left after removing a specified percentage (usually 5% or 10%) of the smallest and largest data. Also called truncated mean.
Assessment
PreActivity Assessment
PreActivity Skills Test: Before starting the activity, administer the PreActivity Test to verify that students know how to obtain central tendency measurements, fivenumber summaries, boxandwhisker plots, clustered bar graphs, and Pareto charts.
Activity Embedded Assessment
Partial Data Graphing and Analysis: As students generate boxandwhisker plots for each of the data sets, oversee their progress and assist as needed.
Analysis Summary File: Require each team to prepare an Excel® file containing tables with its analyzed data and generated statistics. Expect an “outstanding” summary file to include the associated boxandwhisker plots and text boxes that outline the statistical analyses and conclusions. Refer to the Experimental Data Analysis Answer Key.
PostActivity Assessment
Project Results Presentations: Direct teams to create final reports using PowerPoint® (or videos, if that capability is available). Require the reports to include components such as project background, data analyzed, obtained results and related graphs, and corresponding statistical analyses and conclusions, as detailed in the Project Guidelines and Rubrics. For nonstandalone slide shows, students make inperson presentations of their results. Give teams each 10 minutes to make the presentation plus a few extra minutes for Q&A. Use the rubric to grade students’ reports and presentations and assess their comprehension and competence in this statistical analysis project. See the Experimental Data Analysis Answer Key for expected results.
Troubleshooting Tips
Because of the background information necessary to help students make sense of the data to be analyzed, it is important to use the resources in the associated lesson. For some statistical analysis, graphing and results presentations support, you are welcome to request assistance from the author, Miguel R. Ramirez, at mramirez2@galenaparkisd.com.
Activity Scaling
For lower grades, use the data in either a practice or activity format to teach middle school students to obtain means, fivenumber summaries, and to produce boxandwhisker plots by hand or using graphing calculators. Limit the results presentation to a manual sketch of the graphs or, if the resources are available (computers with PowerPoint® and TINspire™ CX Student Software), a slide show with the captured computergenerated graphs.
Additional Multimedia Support
Show students a photograph of the collapsed Alexander Kielland drilling platform structure, at the Norwegian Oil and Gas Association’s Norway’s Petroleum History web page at https://www.norskoljeoggass.no/no/Faktasider/Oljehistorie/.
The following AP Statistics tutorials created by the author may be helpful. They include short videos (4 to 17 minutes), quizzes and notetaking guides.
 Measurements of Central Tendency: https://www.sophia.org/tutorials/apstatisticsch311measuresofcentraltendency?playlist=03averagesandvariation
 Measurement of Variation: Standard Deviation: https://www.sophia.org/tutorials/apstatisticsch322measuresofvariationstandar?playlist=03averagesandvariation
 Coefficient of Variation: https://www.sophia.org/tutorials/apstatisticsch323cofficientofvariation?playlist=03averagesandvariation
 Percentiles and Quartiles: https://www.sophia.org/tutorials/apstatisticsch341percentilesandquartiles?playlist=03averagesandvariation
 BoxandWhisker Plots: https://www.sophia.org/tutorials/apstatisticsch342boxandwhiskerplots?playlist=03averagesandvariation
 Bar Graphs: https://www.sophia.org/tutorials/apstatisticsch211bargraphs?playlist=02organizingdata
 Pareto Charts: https://www.sophia.org/tutorials/apstatisticsch212paretocharts?playlist=02organizingdata
TiNspire™ CAS CX BoxandWhiskers List Spreadsheets and More Screen Captures (5:22 minutes): https://www.youtube.com/watch?v=2RGqAfokjU
Texas Instruments Education Technology Resources:
 TINspire Computer Link Software for Windows (EXE) and Macintosh (DMB); download here.
 Features Summary for TINspire Computer Link Software at https://education.ti.com/en/us/products/computer_software/connectivitysoftware/tinspirecomputerlinksoftware/features/featuressummary
 Features Summary for Standard A to MiniB USB Connectivity Cable at https://education.ti.com/en/us/products/computer_software/connectivitysoftware/standardatominibusbconnectivitycable/features/featuressummary
 TINspire CX / TINspire CX CAS Student Software Guidebook, v 4.2; view online or download PDF at https://education.ti.com/en/us/guidebook/details/en/15E1291AC8CA4EF8A081110D38EB2849/tinspirecxstudentsoftwareguidebook
 Using the TINspire Computer Link Software Guidebook; download PDF at https://education.ti.com/en/us/software/details/en/82035809F7E6474099944056CCB01C20/tinspire_computerlink
 TINspire CX Handheld: https://education.ti.com/en/us/products/calculators/graphingcalculators/tinspirecxhandheld/tabs/overview
References
Brase, Charles H. and Brase, Corrinne P. Understandable Statistics: AP. 11th Edition, CENCAGE Learning, 2015.
Colombi, Pierluigi, Fava, Giulia and Sonzogni, Lisa. (April 2015) “Fatigue Crack Growth in CFRPStrengthened Steel Plates.” In Composites: Part B. https://www.researchgate.net/publication/271274747_Fatigue_crack_growth_in_CFRPstrengthened_steel_plates
ElTahan, M., Dawood, M. and Song, G. (June 2015) “Development of a SelfStressing NiTiNb Shape Memory Alloy (SMA)/ Fiber Reinforced Polymer (FRP) Patch.” Smart Materials and Structures, Vol. 24, issue 6.
Huawen, Ye, Konig, Christian, Ummenhofer, Thomas, Schizhong, Quing and Plum, Robin. “Fatigue Performance of Tension Steel Plates Strengthened with Prestressed CFRP Laminates.” ASCE Journal of Composites for Construction, Vol. 14, issue 5 (Oct. 2010), pp. 609615.
Jones, Sean, and Civjan, Scott. “Application of Fiber Reinforced Polymer Overlays to Extend Steel Fatigue Life.” ASCE Journal of Composites for Construction, Vol. 7, issue 4 (Nov. 2003), pp. 331338.
Liu, Hongbo, AlMahadi, Riadh and Zhao, XiaoLing: “Experimental Study of Fatigue Crack Growth Behavior in Adhesively Reinforced Steel Structures.” In Composite Structures, Vol. 90, no. 1, August 2009.
Peck, Roxy and Olsen, Chris. Statistics. Learning from Data. AP Edition, Brooks/Cole CENCAGE Learning, 2014.
Täljsten, Björn, Hansen, Christian Skodborg and Schmidt, Jacob Wittrup. “Strengthening of Old Metallic Structures in Fatigue with Prestressed and NonPrestressed CFRP Laminates.” Construction and Building Materials, Vol. 23, no. 4, March 2009, pp. 16651677.
Tsouvalis, Nicholas G., Mirisiotis, Lazarus S. and Dimou, Dimitris N. “Experimental and Numerical Study of Fatigue Behavior of Composite Patch Reinforced Cracked Steel Plate.” International Journal of Fatigue, Vol. 31, no. 10, pp. 16131637, September 2009.
Watkins, Ann E., Cobb, George W. and Scheaffer, Richard L. Statistics in Action, 2nd Ed., Key Curriculum Press, 2008.
Other Related Information
AP Statistics topics and timing note: This activity and its associated lesson are intended to be taught during the last six weeks of the school year to address topics covered in the AP Statistics course, including central tendency measurements and fivenumbers summary. The total time required for the lesson and activity is nine 50minute sessions. Use the project results presentation grades that students obtain in the associated activity as part of their first semester final test grades.
Contributors
Miguel R. Ramirez, author, Mathematics Department. Galena Park High School; Mina Dawood, mentor, Environmental and Civil Engineering. University of Houston; Botong Zheng, mentor, Environmental and Civil Engineering. University of HoustonCopyright
© 2016 by Regents of the University of Colorado; original © 2015 University of HoustonSupporting Program
National Science Foundation GK12 and Research Experience for Teachers (RET) Programs, University of HoustonAcknowledgements
This digital library content was developed by the University of Houston's College of Engineering under National Science Foundation GK12 grant number DGE 0840889. However, these contents do not necessarily represent the policies of the NSF and you should not assume endorsement by the federal government.
The author also thanks Fritz Claydon; RET program director, Stuart Long and Debora Rodrigues, RET academic advisors; Mila Taylor, Marjorie Hernandez and Andrea Lee, RET advisors; as well as the National Science Foundation for its funding of the RET program.
Last modified: March 12, 2019
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