Assignment 5 Work Sampling

CEE 4140 Building Information Modeling Fall 2023 Assignment 5: Due September 18, 2023 by 5:00 PM Name: Fukhraj Khairy Section 1: Activity Analysis (30 points) Read the article entitled “Activity Analysis for Direct-Work Rate Improvement in Construction” and answer the following questions. Read the article from the beginning and stop at the end of the “Continuous Improvement” section or just before the “Validation of Activity Analysis” (Read pages 1117 to 1121). 1) According to the article, what is the generally understood definition of productivity in construction? Definition of Productivity in Construction: According to the article, the relationship between inputs and outputs. 2) Cite the two primary purposes for measuring productivity: The article cites two primary purposes for measuring productivity: (a) to control project cost and schedule and (b) obtain data for planning future projects. 3) Name two types of workface assessment techniques. a) Foreman-delay surveys b) Craftsman questionnaires 4) What are the two parts of the Activity Analysis? 1)Workface assessment and 2) Continuous improvement process 5) What are the five major steps to the Activity Analysis? (a) Plan Study, (b) sample, (c) Analyze, (d) plan improvements and (e) Implement improvements . 6) What are three decision criteria elements for the “Plan Study” step?

CEE 4140 Building Information Modeling Fall 2023 Developing the objectives of the study, Defining the sample population, Defining the activity categories, selecting sampling routes and times, determining the minimum sample size, training observers and hosting the craft information session. 7) How is “direct work” defined in the article? the act of exerting physical effort directed toward an activity or physically assisting in these activities. 8) Give three examples of “preparatory-work”. (a) stretching activities, (b) safety talks, and (c) start card processes. Discussions to explain or plan the task at the work location. 9) What is the typically confidence level used by most industrial sectors for work sampling? 95% 10) What is the typical representation of hourly activity rates in construction work sampling? Time series stacked bar chart. 11) What are the three steps of the planning improvement process: 1)List probable causes, 2)Analyze alternatives, and 3) Create a plan for improvement implementation 12) What is the length of sample duration for the results shown in Figure 2? 1 hour 13) What is the total number of recorded observations in Figure 2? 109 14) What are the seven “sampling categories” used for the study performed in Figure 3? Direct work, Prep Work, Tools/Equip, Material ( Handling, Waiting, Travel and Personal) 15) Name three typical causes of excessive material handling detailed in the study.

CEE 4140 Building Information Modeling Fall 2023 Section 2: Work Sampling Field Rating (70 points) Select a construction site that you can observe over some period of time. This can be an active site that you visit, view from afar, or watch recorded videos. You will perform an Activity Analysis on this site. Sampling observations should be performed in 10 minute intervals for 3 separate samples. Use the chart provided below to assign safety performance to each observation (you will need to extend the chart based on how many observations you make). A minimum of 100 observations is required. After your sampling is complete, analyze your observation data. Perform a statistical analysis and discuss results of the dataset. Create graphical representations to show your data and analysis efforts. Activities Sample 1 (Obs 1- 34) Sample 2 (Obs 35- 68) Sample 3 (Obs 69- 102) Direct Work 4 6 7 Preparatory Work 12 7 4 Tools / Equipment 3 5 5 Material Handling 7 8 9 Waiting 2 1 8 Travel 1 3 2 Personal 6 4 3 Mean 5.00 4.86 5.43 Standard Deviatio n 3.95 2.20 2.05 Median 4 4.5 5 Maximum 12 8 9

CEE 4140 Building Information Modeling Fall 2023                           Dir ect Work Preparatory Work Too ls / Equipment Mat er ial Handl in g Waiting Travel Pers on al 0 2 4 6 8 10 12 14 Activity Analysis Across Trio Samples Sample 1 (Obs 1-34) Sample 2 (Obs 35-68) Sample 3 (Obs 69-102) Activities Number of Observations 11.43% 34.29% 8.57% 20.00% 5.71% 2.86% 17.14% Distribution of Activities Across All Observations Direct Work Preparatory Work Tools / Equipment Material Handling Waiting Travel Personal