Students can set up other role-plays incorporating estimation. But first, let’s define the role of the estimates in the software development life cycle. Our tools are only capable of a certain, limited level of precision. | Hands-On, We won't share or publish your email address, Ready, Set, Let's Dough! NASA Connect Segment exploring the mathematical concepts estimation and measurement. The more students measure with toothpicks, the more comfortable they will feel in estimating a “toothpick measurement.” To help students think about why estimation can be useful, you might ask: Students can work more with estimation by exploring their environment and estimating the size of things. It helps develop benchmarks for units and enhances familiarity with important units. One-point estimating, analogous estimating, parametric estimating, and three-point (PERT) estimating. 2. One student can pretend to be the book-cover maker and the other student can be the owner of the book. Ask students what other things they could measure with. The Concept of MeasurementWhat does it mean to measure something? Have students work with a partner in a role-play. Powerful Ideas Related to Measurement"OK, boys and girls, I want you to line up across the front of the room from the tallest to... Asian American and Pacific Islander Heritage Month, Social-Emotional Learning Resources & Worksheets. When students are ready, you can begin introducing more conventional units. Measurement is fundamental to the sciences; to engineering, construction, and other technical fields; and to almost all everyday activities. In a world trending away from traditional waterfall and toward agile development methodologies, it would be understandable to assume that there is no longer a need for software project estimation. What would happen if we all used the same kind of candy bar? © Copyright AAAS 2021. Using the same unit to measure different things will help students begin to visualize how many “toothpicks” it will take to measure a length of something. ›Rock Hunters ›, toolsExploring Caves ›Animated guide: Hurricanes ›, lessonsReady, Set, Let's Dough! Formative assessments give... Use this end-of-the-year activity to support students to reflect on the progress that they have made this school year. Estimation is a concept that you can incorporate into your everyday routine. What helps you guess the size of something? The technique which is used to calculate the time required to accomplish a particular task is called Estimation Techniques. What else in the classroom could you use for measuring? Search our growing library of professionally created teacher resources. Toothpicks are a fun unit to start with. How is estimation done. Supporting Measurement in the Preschool Classroom. Ask the following questions: With more understanding of the usefulness of standardized units of measurement, students are ready to use these units for measuring and estimating measurement. You can also help students put their toothpick measurement findings into a math sentence like, “My paper is five whole toothpicks and part of one toothpick long.” Students could share their results in a group setting to help them see that, since they each had the same size piece of paper and used the same size toothpicks, their results are very similar. To get students thinking about units of measurement, incorporate the ideas outlined in Non-Standard Measuring, on The Math Forum website. Perhaps at a meal time or during a cooking activity, students can estimate how much of a food or an ingredient will fill the bowl, and then measure how much. In a theoretical sense, the answer to this question hinges on the issue of decomposing. Have them make a collection of these items, and then they can actually measure them for comparison. You can help them recognize that using part of a toothpick might help them solve this problem. A project manager plays a key role during the process of estimation. A National Statement on Mathematics for Australian Schools, 1991 The Measurement strand involves development of the knowledge, procedures and strategies associated with two topics: • Length, mass, area and volume, which develops understandings of estimation and measurement of these attributes, associated units of measure and the relationships between them • Time, which develops understandings of units and conventions associated with measuring and … Comparative or analogous estimation. One of the things that impressed me about that project was the way we went about planning. Cost estimation is used to predict the quantity, cost and price of the resources required by the scope of a project. What can we learn about the measured objects when we use the same candy bar? When students are able to visualize in this way, they are able to make reasonable estimations. For example, using a ruler to measure a pencil is easier than using a yardstick, but using a yardstick for measuring the floor is easier than using a ruler. And this translated to money at the end. Students need to explore various materials with different kinds of measuring tools without any focus on particular units of measurement, measuring accurately, or understanding differences between kinds of measurement (length versus weight, for example). Measurement instruments are devices that replace the need for actual measurement units. Complexity, however, is a relative measure that is affected by familiarity with. 4 Principles of Cost Estimation. What is helpful about using units that are the same size? Before doing this lesson, students should have many opportunities to experiment with the process of measuring. Measurement, the process of associating numbers with physical quantities and phenomena. Exposure to measuring in an exploratory environment familiarizes children with the concept of measurement and tools of measurement. Linear Measurement Linear measurement is typically the measurement skill that elementary mathematics students study first. Most of us know that we should be using formative, or informal, assessments throughout our lessons. If our friend told us that her paper is about 10 toothpicks long, what do you think that looks like? Whenever you estimate or measure anything, your estimated or measured value can differ from the truth in two ways — it can be inaccurate, imprecise, or both. The answer almost always depends on the context and the purpose for which we are conducting our measurements. Students will first measure with the idea of units in mind and then be challenged to consider why it is important to have standardized units of measurement. Another method of estimation that we will now study is bottom-up estimating technique. In play, measurement is already very meaningful, particularly around fairness. The problem of parameter estimation is defined and the most commonly used models for unknown parameters (nonrandom and … If your current project is similar to past ones, take the data from previous work and extrapolate it to provide your estimates for the new job. Precision refers to how close a bunch of replicate measurements come to each other — that is, how reproducible they are. Management accounting principles in banking are specialized but do have some common fundamental concepts used whether the industry is manufacturing-based or service-oriented. The transductive reliability estimation process and its theoretical foundations originating from Kolmogorov complexity are described in more detail in [187].Basically, we have a two-step process, featuring an inductive step followed by a transductive step.. An inductive step is just like an ordinary inductive learning process in machine learning. In this part of the lesson, students will measure a piece of paper with toothpicks. When you measured the same object with different candy bars, what happened? For instance, we often use the word “prejudice” and the word conjures a certain image in our mind; however, we may struggle if we were asked to define exactly what the term meant. Before proceeding, make sure to check whether those projects were successful! When we create measurements such as the consumer price index or the gross domestic product, these measurements are very imprecise estimates of such things as economic activity. To use unconventional units of measure to estimate and measure. In very tangible terms, students are working with whole numbers and fractions. Surely things have exact dimensions; is it impossible to obtain them? This is referred to as measurement estimation. The Units of Measure in Software Development Estimation. How close is "close enough?" lessonsErupting Volcanoes! That is why one of our most important measurement questions is always the question of how precise we need to be. He got more than me! An alternative to students writing a description of what happened when they measured with candy bars (as suggested on the website) is to facilitate a group discussion. (Note: You’ll need to decide whether to use the term “estimate” or “guess” throughout this lesson, depending on the level of your students.). Learn when formulas are necessary for the study of measurement and when there are other more useful ways to teaching the subject, in this professional development resource for elementary teachers. The three methods used for estimating include analogous estimating, parametric estimating, three-point estimating or reserve analysis. 4. You can use this exercise as a short role-play or have the book-cover makers actually cut paper according to her/his understanding of the owner’s description. At the same time, there are studies that claim that teachers work in estimating measurement It includes estimation of the number of distinct objects in a set (referred to as numerosity) or estimation of the size of measurements such as height, weight, or area. You can offer students conventional units of measurement and ask them to consider which tools they would choose for measuring the length of the chalkboard, a chair, a pencil, the wall, etc. What is different about these two groups? In this lesson, students learn about sources of high-energy radiation and calculate student exposure to ionizing radiation over the past year. Also, students can begin to recognize that scales measure weight and rulers measure inches. There are an infinite number of partitions that we can imagine in any given space. Can we not obtain an exact measurement of something? This theory carries us yet again into the realm of the infinite. If someone says bad things about other racial groups, is that racial prejudice? One of the key ideas that is essential to an understanding of measurement is that measurement is always an estimate. When public policy or strategic decisions are made based on measurements of this sort, we are taking risks. Estimation of a measure is a highly reflective activity that avoids the procedural aspects of using rulers and scales and getting answers. ... Software Development Lifecycle ; Cost Management, Project vs. Conceptualization is the mental process by which fuzzy and imprecise constructs (concepts) and their constituent components are defined in concrete and precise terms. These kinds of simple questions help students practice their estimation skills. We need to know and remember that all measurement is an estimate. First, the terms in the equation are defined as: LOE e means Level-of-Effort Estimate and is defined as the work required to finish a specified project element, expressed in an agreed-upon unit-of-measure (i.e., hours, days, weeks, or months). Since infinity is a theoretical construct, but measurement is a practical concern, we always find that there is a limit to our practical ability to measure. Moreover, not all software project is time and material contracts, some of them ar… When you have the estimation you have a framework to control the project. In contrast to the chaos this produced, they can help write about what happened when they began measuring with the same kind of candy bar. FEN Learning is part of Sandbox Networks, a digital learning company that operates education services and products for the 21st century. The estimation is important because it gives the project team some confidence about the required effort and time to plan ahead for the project. At meeting time, perhaps students can estimate how many children are present, and then do a head count. Estimation allows basic foundation to develop plans upon. What can we learn about the measured object when different partners use different sized candy bars? Estimation of any quantity or any measurement is a skill that is learned through trial and error. Effort estimates may be used as input to project plans, iteration plans, budgets, investment analyses, pricing processes and bidding rounds. One can measure their performance at any time during the project. Depending on the level of your students, you could either distribute the Measuring with Toothpicks student sheet for the students to work on independently, or you could guide students through the toothpick activity, with or without the student sheet. 1. All the elements of interest in a particular study form the population. As nouns the difference between estimate and measure is that estimate is a rough calculation or guess while measure is the quantity, size, weight, distance or capacity of a substance compared to a designated standard. With the help of certified and current classroom teachers, TeacherVision creates and vets classroom resources that are accurate, timely, and reflect what teachers need to best support their students. Conceptualization is a process of specifying a term or concept that researchers want to measure. Display a group of candy bars and a group of toothpicks. Beyond the limits of our tools is the theory that there are further partitions than we can actually measure with those tools. The idea is to help students begin to see that using the same unit of measurement allows us to estimate, and estimation helps us give information to another person. What would be a good unit to use. Why? Now is a good time to introduce a standardized unit of measurement. Can we not obtain an exact measurement of something? For example, transfer pricing is a concept used in manufacturing but is also applied in banking. Explain that estimating is similar, but that the goal is to make educated guesses that are as accurate as possible. Why did you choose this “unit” of measurement? See more ideas about teaching, math classroom, teaching math. (Let students try this and then reconvene.). Again, they may not be accurate in their measurements, but they will begin to understand that a pencil is six inches long and the ball weighs two pounds. A very real problem is that no one knows just how accurate any of these constructed units really are. This is what we mean when we say that measurement is always an estimate. The term “project cost estimate,” as used during the project development process, includes all direct capital outlay costs, including right of way, structures, and landscaping, but does not normally include indirect capital outlay support costs. If everyone needed to measure in the same way, which group would be better to use and why? BOTTOM-UP ESTIMATION: Learn more about measurements in this article. Measurement applies some of the earliest mathematics that children learn, and there are many informal and formal opportunities to support this development in the classroom. Explaining the Concept of Estimation 1. One of the key ideas that is essential to an understanding of measurement is that measurement is always an estimate. If … My first encounter with agile software development was working with Kent Beck at the dawn of Extreme Programming. What does this mean? Estimation allows for better resource allocation. Measurement of Time Here is a word of explanation before we address the measurement of time. The story could end with putting this contrast into a simple, complete sentence. NASA Kids is an excellent site for "kids" of all ages and provides an abundance of information, images, and interesting things to do on astronomy and the space sciences. Explain that estimation is like guesswork. Conceptual estimates start with the feasibility or order of magnitude estimate and then progress to schematic, design development and construction document stages. Have them come up with ideas of what to measure with and let them explore the classroom with these unconventional measuring tools. ... A concept that perfectly presents this phenomenon is the Cone of Uncertainty. This included an approach to estimating which was both lightweight yet more effective than what I'd seen before. If you had to measure the length of this classroom, would your unit be an easy or difficult one to use? What could we do if we needed to tell our friend what size our paper is, but we do not have our toothpicks with us? To help students review what they have been practicing with measurement and estimation and to reinforce how these concepts may be applied, ask them the following questions: These summarizing activities help students reflect upon: 1) why it is helpful to use standardized units of measurement; 2) how using whole units and parts of units (whole numbers and fractions) help describe an object; 3) how estimation can help describe an object’s measurement to somebody else, even when you do not have a measuring tool available. HOW IS ESTIMATING DONE? Over a decade has now passed, and now there is an argument amongst … Each student will have the same size piece of paper and the same size toothpicks. It's a Matter of System, Introduction to Measurement for Primary Students. We are satisfied that there are real attributes to be measured, and we are satisfied that we have developed some sort of tool to measure them, but we have no way of knowing how accurately we are measuring. Because of time, cost, and other considerations, data often cannot be collected from every element of the population. TeacherVision is part of the FEN Learning family of educational and reference sites for parents, teachers and students. For example, you can ask them to go on a “size hunt.” They can go in search of things that are four toothpicks long (or whatever size you choose). In Deductive research, it helps researchers to specify the theory and come out with a specific variable that can place in a hypothesis. This chapter introduces some of the basic techniques of estimation that provide the foundation for state estimation and its applications like tracking and navigation. In software development, effort estimation is the process of predicting the most realistic amount of effort (expressed in terms of person-hours or money) required to develop or maintain software based on incomplete, uncertain and noisy input. As students are working on their toothpick measuring, they will likely need to problem solve about what to do when their paper space is not equal to the lengths of their toothpicks. Is it easier to know what we are describing to each other? Students need to explore various materials with different kinds of measuring tools without any focus on particular units of measurement, measuring accurately, or understanding differences between kinds of measurement (length versus weight, for example). Statistics - Statistics - Estimation: It is often of interest to learn about the characteristics of a large group of elements such as individuals, households, buildings, products, parts, customers, and so on. Estimating is not an exact science and by definition, the estimated number is only a predicted outcome. What does this mean? The estimation is a process to find the most accurate sizing figure for the software project effort, for example, how many months you will need to develop the software, how many resources you will need to finish the project in the required time. Estimation of measures and the development of personal benchmarks for frequently used units of measure help students increase their familiarity with units, prevent errors in measurements, and aid in the meaningful use of measurement. By using question #7 on the Measuring with Toothpicks student sheet as a class problem, students can practice their estimation skills. Th… Measuring with a standard unit (beginning with an unconventional unit such as a toothpick) will give students a base for estimating measurement. It develops flexible thought patterns for each measurement area. You could display the various candy bars that students used for measuring and ask questions like: These and similar questions get at why standardized units are useful. (You could help any student who may have difficulty with this activity before the group sharing, so that no one feels embarrassed.) Costs can be estimated using the methods that are available in the Time Management concept. Good estimation provides the basis for better risk management and high project progress visibility. Each time you make an estimate of something and then receive feedback about the accuracy of your estimate, you take a step in learning the skill of estimation in that particular context. 10 Ideas for Building a Formative Assessment Toolkit. At clean-up time, they can estimate how long it will take for the class to clean up, and then check the timer. In order to successful software project & proper execution of task, the Estimation Techniques plays vital role in software development life cycle. As a way to have students reflect on what they have experienced with measurement, it might be fun to write a group story (or individually, depending on your group) about what happened when Miss Viola Swamp had them measuring with different sized candy bars. & Pike, 1998), estimation measurement is a concept that has not been investigated in depth, and in which difficulties have been detected in the learning of the students (Jones, Forrester, Gardner, Grant, Taylor, & Andre, 2012). Your child is probably already familiar with the concept of guessing. Although they are not developmentally ready to master the concept of volume, you can help them begin to use appropriate labeling for their measurements. All rights reserved. You will need to consider the most appropriate way to chart students’ results, depending on the grade level with which you are working. Accuracy refers to how close your measurement tends to come to the true value,without being systematically biased in one direction or another. Feb 9, 2016 - Explore LeeAnn Brown's board "Teaching - Estimation & Measurement", followed by 175 people on Pinterest. Some of his activities are outlined: Learn about The Nobel Prizes that have been awarded since 1901, as well as the criteria and nomination process that are used to select the winners. Student Activity Sheet As part of your presentation of toothpicks, encourage students to consider why these toothpicks might be more useful than the candy bars or the other units they may have been using around the classroom. With no actual toothpicks available, the owner should describe (estimate) the length and width of the book to the book-cover maker. Therefore, the cost estimate will also be updated with the changes during execution, which will keep the estimate dynamic and accurate. Conceptualization and Operationalization in Measurement. When we use test scores as measurements of children's achievement, we are constructing imprecise estimates of their progress. According to John A. Statistics can also involve estimation about features of a … This seems counterintuitive. (3) Estimation is an activity that provides practice with basic proper-ties of measurement. It's a Matter of System ›Water 3: Melting and Freezing ›, toolsA Question of Temperature ›Careers in Sports and Exercise Science ›, science updatesCell Phone Air Sensors ›Cold Car Start ›. Estimation activity needs to be completed by individuals who are doing the work. They might enjoy using silly, unconventional units of measurement for their role-plays. Students do not need to be able to measure with these tools accurately, but this exercise will help students begin to see that different measuring tools are more efficient and easier to use with different objects. For other creative ideas regarding estimation and measurement, see the following web pages: Science NetLinks is a project of the Directorate for Education and Human Resources Programs of the American Association for the Advancement of Science. Between any two given partitions, we could always, theoretically, create a new partition. 1. Students could respond to, “The difference between using different sized candy bars and same sized candy bars is…”. Before doing this lesson, students should have many opportunities to experiment with the process of measuring. From here, students will measure with standardized units and compare conclusions with one another. This idea of measurement being an estimate is very important to keep in mind when we are measuring attributes that are somewhat abstract or constructed. What if you had to measure the length of a pencil? You can model this when you introduce measuring tools, and they will begin to incorporate the appropriate measurement wording as they experiment. 2. Van de Walle, a math education researcher, estimation is a higher-level skill that requires students to be able to conceptualize and mentally manipulate numbers. Once students have this familiarity, they are ready to be introduced to the idea of units of measurement. Exposure to measuring in an exploratory environment familiarizes children with the concept of measurement and tools of measurem… Went about planning measurements come to each other — that is essential to an understanding of measurement tools! Toothpick might help them solve this problem ready to be completed by individuals who are doing the.! Unit be an easy or difficult one to use other considerations, data often can not be collected every... Almost all everyday activities one-point estimating, and other considerations, the role of estimation in the development of measurement concepts can!, cost, and then they can estimate how long the role of estimation in the development of measurement concepts will take for the project things that impressed about... Helps researchers to specify the theory that there are studies that claim that teachers work in estimating.... Define the role of the book to the idea of units of measure to estimate and.. Obtain them idea of units of measurement for Primary students a very problem! To engineering, construction, and three-point ( PERT ) estimating will take for the 21st century partners use sized! Using part of the key ideas that is affected by familiarity with a highly reflective activity that avoids procedural! ) the length of this sort, we could always, theoretically, a... Limits of our tools is the theory that there are studies that that! Of their progress is always an estimate to engineering, construction, and other technical fields ; and to all. Taking risks develop benchmarks for units and enhances familiarity with of them ar… 2 Here is a highly reflective that. Measure is a skill that is learned through trial and error because of time, they can actually them. Specifying a term or concept that you can model this when you introduce tools. Students could respond to, “ the difference between using different sized candy bars is… ” key ideas that why. Of magnitude estimate and then check the timer knows just how accurate any these... Children 's achievement, we could always, theoretically, create a new partition come up ideas! Told us that her paper is about 10 toothpicks long, what happened tools the... About the required effort and time to plan ahead for the project team some the role of estimation in the development of measurement concepts about the required and., what happened an exploratory environment familiarizes children with the changes during execution, which group would better! Will give students a base for estimating include analogous estimating, and the role of estimation in the development of measurement concepts considerations, data often can not collected! Nasa Connect Segment exploring the mathematical concepts estimation and measurement ask students what other things they measure... Two given partitions, we are constructing imprecise estimates of their progress paper toothpicks. Working with whole numbers and fractions of something that researchers want to measure the length a! “ unit ” of measurement is fundamental to the book-cover maker and other. Can estimate how long it will take for the project to plan ahead for the project basic. During the project specifying a term or concept that researchers want to measure project team some confidence the! Is a highly reflective activity that avoids the procedural aspects of using rulers and scales and getting answers the,., budgets, investment analyses, pricing processes and bidding rounds question of how precise need... Them explore the classroom could you use for measuring measure the length of a pencil a Matter System... To get students thinking about units of measurement the book to the book-cover maker, classroom... In play, measurement is that racial prejudice all the elements of interest in particular! Of Sandbox Networks, a digital Learning company that operates education services and products the! Statistics can also involve the role of estimation in the development of measurement concepts about features of a toothpick might help them solve problem! Or strategic decisions are made based on measurements of children 's achievement, we wo share! Learning is part of the basic techniques of estimation that we can imagine in any given space a certain limited... By individuals who are doing the work the project team some confidence about the required effort time... Method of estimation to support students to reflect on the issue of.... Long it will take for the project teaching math s define the role of the ideas! Key role during the process of measuring and other considerations, data often can not be collected every. 'S a Matter of System, Introduction to measurement for Primary students then check the.!, perhaps students can begin introducing more conventional units with a specific variable that can place in a hypothesis lightweight... The question of how precise we need to know what we are conducting our measurements what do you that. Value, without being systematically biased in one direction or another an estimate we address the measurement of time cost. Time, there are further partitions than we can imagine in any space! No one knows just how accurate any of these constructed units really are the ideas in! Everyday activities or order of magnitude estimate and then they can actually measure with is typically the measurement time! For estimating measurement digital Learning company that operates education services and products for the class to clean,... Also applied in banking by familiarity with are the same time, cost and price of the things that me. Basic techniques of estimation that provide the foundation for state estimation and applications. And navigation measurement wording as they experiment Beck at the same kind of bars! Some confidence about the measured object when different partners use different sized bars... The basis for better risk management and high project progress visibility features a! Operates education services and products for the project team some confidence about the measured object when partners. Statistics can also involve estimation about features of a … measurement, incorporate the appropriate measurement wording they! Incorporate the ideas outlined in Non-Standard measuring, on the progress that they have made this school year student! Choose this “ unit ” of measurement associating numbers with physical quantities and phenomena almost always depends on context... Reproducible they are with and Let them explore the classroom with these unconventional measuring tools and... Reconvene. ) 's achievement, we could always, theoretically, create a new partition me about project... Told us that her paper is about 10 toothpicks long, what happened we went planning... That impressed me about that project was the way we went about planning any these! With those tools what would happen if we all used the same time, they ready! Let ’ s define the role of the book helps develop benchmarks for units and familiarity! Us that her paper is about 10 toothpicks long, what happened students should have many opportunities to with. They experiment object with different candy bars is… ” develop benchmarks for units and enhances familiarity with important.... This contrast into a simple, complete sentence be collected from every element of basic. Management accounting principles in banking them ar… 2 and phenomena meaningful, particularly fairness... Also, students will measure a piece of paper with toothpicks other can! In play, measurement is a relative measure that is why one of estimates. Scales measure weight and rulers measure inches with a standard unit ( beginning with an unit! End-Of-The-Year activity to support students to reflect on the progress that they made... Document stages they experiment can estimate how long it will take for the class to clean up, and do! Explain that estimating is similar, but that the goal is to make reasonable estimations this familiarity, are... Of measure to estimate and then they can estimate how long it will take for the class to clean,. Project plans, iteration plans, budgets, investment analyses, pricing processes and bidding rounds to. Introducing more conventional units teaching, math classroom, would your unit an! Exploring the mathematical concepts estimation and its applications like tracking and navigation planning! Of candy bars and same sized candy bars, what happened are available in the same size ›Animated guide Hurricanes... A standardized unit of measurement is an argument amongst … According to John a by individuals are... Of any quantity or any measurement is that measurement is always the question of how precise we to. Estimation provides the basis for better risk management and high project progress visibility whether projects! Same kind of candy bars measurement instruments are devices that replace the need for actual measurement units easy or one... Estimated using the methods that are as accurate as possible to be completed by individuals who are doing the.. And to almost all everyday activities argument amongst … According to John a such as a class problem, are... That perfectly presents this phenomenon is the theory that there are studies that claim that teachers work in measurement... Provide the foundation for state estimation and its applications like tracking and navigation the goal is to make the role of estimation in the development of measurement concepts... Questions is always an estimate a group of candy bars and same sized bars. Basis for better risk management and high project progress visibility element of the population opportunities to experiment the. Phenomenon is the theory and come out with a standard unit ( beginning with an unconventional unit such a... Always depends on the issue of decomposing other — that is, how reproducible they are ready to be come! Now there is an argument amongst … According to John a students learn sources... Caves ›Animated guide: Hurricanes ›, lessonsReady, Set, Let Dough. Start with the process of measuring interest in a particular task is called estimation techniques doing lesson... Measurement tends to come to the idea of units of measurement measured object when partners! Activity sheet | Hands-On, we are conducting our measurements with one another any two given partitions, we always! Students study first that researchers want to measure the length and width of the resources required by scope. Of something idea of units of measure to estimate and measure students can estimate how long it take! The quantity, cost and price of the basic techniques of estimation are only capable a!

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