{"id":102,"date":"2020-06-04T19:20:58","date_gmt":"2020-06-04T19:20:58","guid":{"rendered":"https:\/\/libraryresources.nse.org.ng\/me270baughman\/chapter\/qfd-with-dm\/"},"modified":"2026-03-16T13:57:59","modified_gmt":"2026-03-16T13:57:59","slug":"qfd-with-dm","status":"publish","type":"chapter","link":"https:\/\/libraryresources.nse.org.ng\/me270baughman\/chapter\/qfd-with-dm\/","title":{"raw":"Chapter 3: QFD (House of Quality w\/Decision Matrix) - HoQ w\/DM","rendered":"Chapter 3: QFD (House of Quality w\/Decision Matrix) &#8211; HoQ w\/DM"},"content":{"raw":"<img class=\"resizable alignright\" src=\"https:\/\/www.softchalkcloud.com\/lesson\/files\/Fr9b0A7Tw4gqB8\/light_bulb.jpg\" alt=\"Image of light bulb\" width=\"104\" height=\"139\">\n<h2><span style=\"color: #1b3b80;\">Introduction<\/span><\/h2>\nYour team developed an expansive list of design solution concepts for basic product functions identified using function trees\/functional decomposition and morphology.\n<h2><span style=\"color: #1b3b80;\">Next steps<\/span><\/h2>\n<span class=\"loose\">Use House of Quality (QFD) with Decision Matrix to guide, justify, and document your decision in final concept selection:<\/span>\n<ol>\n \t<li><span class=\"loose\"><strong><em>Identify<\/em><\/strong> and select a full product concept to take into the detailed design;<\/span><\/li>\n \t<li><span class=\"loose\"><strong><em>Synthesize<\/em><\/strong>\u00a0the basic function of generated concepts;<\/span><\/li>\n \t<li><span class=\"loose\"><strong><em>Evaluate<\/em><\/strong>\u00a0concepts against engineering metrics and features (and thus the customer requirements);<\/span><\/li>\n \t<li><span class=\"loose\"><strong><em>Select<\/em><\/strong>\u00a0a product concept to take into detailed design.<\/span><\/li>\n<\/ol>\n<h2><span style=\"color: #1b3b80;\">Evaluating Generated Concepts: How to pick the best option<\/span><\/h2>\n<ul>\n \t<li>Utilize the House of Quality Decision Matrix - Engineering Specifications: features, functions, and characteristics, directly linked to Customer Requirements.<\/li>\n \t<li>Evaluate only your top 3-4 concepts (review assignment requirements).<\/li>\n<\/ul>\n<h2><span style=\"color: #1b3b80;\">MIRE TECH Team Final Stove: An Example<\/span><\/h2>\n<span class=\"tight\">Let's take a look at MIRE TECH's Functional Analysis and Morphological Charts\/Matrices in generating their final stove design. <\/span>\n\n<span class=\"tight\">The team used <\/span><span class=\"tight\"><strong>Functional Analysis<\/strong> to determine which functions are critical for the stove to achieve the main functionality.\u00a0<\/span>\n\n<span class=\"tight\">The\u00a0<strong>functional analysis of the hex stove<\/strong> is a model that follows energy, more specifically heat, from the inputs to the outputs of the system. It is a very <\/span><span class=\"tight\">broad overview of the path the energy takes through the system but is expanded upon in greater detail in the mathematical model. The math model accounts <\/span><span class=\"tight\">for all energy changes and transfers while the functional analysis ignores all losses for simplification.<\/span>\n\n<img class=\"aligncenter wp-image-96 \" src=\"https:\/\/libraryresources.nse.org.ng\/wp-content\/uploads\/sites\/11\/2020\/06\/Heat-transfer-stove-diagram.png\" alt=\"A flowchart showing combustion which uses heat energy transferred to air and finally to a stove and pot to create a hot cooking surface and thermal equilibrium.\" width=\"330\" height=\"515\">\n\n<span class=\"tight\">Based on the team's morphological charts, the top 4 designs below (Concept Selection) were brought forward:<\/span>\n\n[caption id=\"\" align=\"aligncenter\" width=\"315\"]<img class=\"resizable\" src=\"https:\/\/www.softchalkcloud.com\/lesson\/files\/Fr9b0A7Tw4gqB8\/paste_image2.png\" alt=\"The four concept stoves, basic sketches in pencil. \" width=\"315\" height=\"424\" longdesc=\"https:\/\/www.softchalkcloud.com\/lesson\/files\/Fr9b0A7Tw4gqB8\/ada_files\/ada_image3.html\"> Stove concepts for selection - Concept 1 morphology. Options include a rocket stove, skirt stove, closed-bottom stove, and an open-bottom stove.[\/caption]\n\n<div class=\"textbox textbox--examples\"><header class=\"textbox__header\">Example Exercise<\/header>\n<div class=\"textbox__content\">\n\n<span style=\"color: #1b3b80;\">Watch the interactive video below and answer the questions: HoQ w\/Decision Matrix<\/span>\n\nThe original version of this chapter contained H5P content. You may want to remove or replace this element.\n\n<a href=\"https:\/\/libraryresources.nse.org.ng\/wp-content\/uploads\/sites\/11\/2026\/03\/House-of-Quality-with-Decision-matrix_Video-Script.pdf\">House of Quality with Decision matrix_Video Script [PDF]<\/a>\n\n<\/div>\n<\/div>\n<h3><span style=\"color: #1b3b80;\">Look at MIRE TECH team's evaluation of their four top concepts:<\/span><\/h3>\n<table class=\"grid aligncenter\" style=\"width: 75%;\"><caption>Table 1. MIRE TECH team's stove concepts evaluation<\/caption>\n<thead>\n<tr>\n<td style=\"text-align: center; width: 25.1451%;\"><strong><span class=\"tight\">Rocket Stove\n<\/span><\/strong><\/td>\n<td style=\"text-align: center; width: 21.3733%;\"><strong>Skirt Stove\n<\/strong><\/td>\n<td style=\"text-align: center; width: 28.0464%;\"><strong>Closed Bottom<\/strong><\/td>\n<td style=\"text-align: center; width: 25.4352%;\"><strong>Open Bottom\n<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: center; width: 25.1451%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 21.3733%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 28.0464%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 25.4352%; background-color: #fdc7c7;\">9<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center; width: 25.1451%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 21.3733%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 28.0464%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 25.4352%; background-color: #ffffe0;\">3<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center; width: 25.1451%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 21.3733%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 28.0464%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 25.4352%; background-color: #fdc7c7;\">9<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center; width: 25.1451%; background-color: #ffffe0;\">3<\/td>\n<td style=\"text-align: center; width: 21.3733%; background-color: #ffffe0;\">3<\/td>\n<td style=\"text-align: center; width: 28.0464%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 25.4352%; background-color: #fdc7c7;\">9<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center; width: 25.1451%; background-color: #ffffe0;\">3<\/td>\n<td style=\"text-align: center; width: 21.3733%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 28.0464%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 25.4352%; background-color: #fdc7c7;\">9<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center; width: 25.1451%; background-color: #ffffe0;\">3<\/td>\n<td style=\"text-align: center; width: 21.3733%; background-color: #ffffe0;\">3<\/td>\n<td style=\"text-align: center; width: 28.0464%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 25.4352%; background-color: #fdc7c7;\">9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\nThe highest scoring design is the MIRE-TECH team's choice to move forward with, and the selected concept!\n\nThe cut-out image below shows what the DMADVR toolbox view once it is completed in the House of Quality w\/Decision Matrix tab completed for the engineering team's concepts. The Closed Bottom is the winner!\n\n<img class=\"aligncenter wp-image-97\" src=\"https:\/\/libraryresources.nse.org.ng\/wp-content\/uploads\/sites\/11\/2026\/03\/MIRE_TECH-QFD-DM.jpg\" alt=\"Concept scoring table\" width=\"456\" height=\"342\"><img class=\"alignright\" style=\"margin-bottom: -1ex;\" src=\"https:\/\/www.softchalkcloud.com\/lesson\/files\/Fr9b0A7Tw4gqB8\/final%20stove.png\" alt=\"Final hex stove design\" width=\"167\" height=\"163\">\n<h3><span style=\"color: #1b3b80;\">Final design: Closed Bottom (Hex Stove)<\/span><\/h3>\nThough each stove was a significant improvement from a three-stone ring fire, the closed bottom design scored the highest and was chosen for development.\n\nThe closed bottom concept is a simple design where the fire is completely contained within the stove and not burning on the ground. It is made from clay (low cost), contains all flames making it safe to use, is lightweight for portability, has minimal features for assembly, is very easy to operate, and is much more efficient than the three-stone method.\n\n[caption id=\"attachment_98\" align=\"aligncenter\" width=\"1562\"]<img class=\"wp-image-98 size-full\" src=\"https:\/\/libraryresources.nse.org.ng\/wp-content\/uploads\/sites\/11\/2026\/03\/firelfly-3.jpg\" alt=\"A large table showing comparison scores for a house of quality. \" width=\"1562\" height=\"1207\"> <a href=\"https:\/\/libraryresources.nse.org.ng\/wp-content\/uploads\/sites\/11\/2026\/03\/Firefly_HoQ-with-Decision-Matrix.pdf\">Download a pdf of the decision matrix to enlarge and review [PDF]<\/a>[\/caption]This House of Quality with Decision Matrix shows the Now vs. What.\u00a0 The Now area is the current products on the market that the engineering design team has researched. The What area is what the team concepts are for solving the design need. The numbers are how both the Now products on the market and the engineering design team's concept assessments based on the customer requirement assessment of 1, 3, 9.\u00a0 How does the team know which of their concepts is the top one or the design they are most likely to select? Well, the highest scorer is the one they need to consider as the recommended final design, and this would be the score of 2277 for the Lightning Bug Design. You can also see this in the image below. The Firefly's design team's final concept assessment indicates the Lightning Bug is the design they will move forward with based on an objective high score. The scoring removes subjectivity as much as possible in order to allow the team to make an objective decision based on their assessment analysis. However if the the top 2-3 designs scored within 10% of each other, the team should consider reviewing their assessment and to determine of re-scoring is needed. Another option is for teams to consider combining the best elements and then re-score to determine the best design choice with the highest score.\n\nSee below a cut-out image of the final scoring assessment where the team has scored The Lightning Bug as the final design. This decision was based on the highest score!\n\n<strong>Reminder:<\/strong> In ME\u00a0 270, only use 1, 3, 9\u00a0 values are used to assess within the House of Quality (HoQ\/QFD). This Firefly Team example deviates from this but it is an illustration of the process of completing a HoQ.\n<h3><span style=\"color: #1b3b80;\">Firefly Team's Concept Assessment:\u00a0<\/span><\/h3>\n[caption id=\"attachment_98\" align=\"aligncenter\" width=\"320\"]<a href=\"https:\/\/iastate.pressbooks.pub\/app\/uploads\/sites\/33\/2020\/06\/Fire-fly.jpg\"><img class=\"wp-image-99 \" src=\"https:\/\/libraryresources.nse.org.ng\/wp-content\/uploads\/sites\/11\/2026\/03\/Fire-fly.jpg\" alt=\"A section of the concept table, including the &quot;Now versus what&quot; section.\" width=\"320\" height=\"402\"><\/a> Click on the image to enlarge and review[\/caption]\n\nThe original version of this chapter contained H5P content. You may want to remove or replace this element.","rendered":"<p><img decoding=\"async\" class=\"resizable alignright\" src=\"https:\/\/www.softchalkcloud.com\/lesson\/files\/Fr9b0A7Tw4gqB8\/light_bulb.jpg\" alt=\"Image of light bulb\" width=\"104\" height=\"139\" \/><\/p>\n<h2><span style=\"color: #1b3b80;\">Introduction<\/span><\/h2>\n<p>Your team developed an expansive list of design solution concepts for basic product functions identified using function trees\/functional decomposition and morphology.<\/p>\n<h2><span style=\"color: #1b3b80;\">Next steps<\/span><\/h2>\n<p><span class=\"loose\">Use House of Quality (QFD) with Decision Matrix to guide, justify, and document your decision in final concept selection:<\/span><\/p>\n<ol>\n<li><span class=\"loose\"><strong><em>Identify<\/em><\/strong> and select a full product concept to take into the detailed design;<\/span><\/li>\n<li><span class=\"loose\"><strong><em>Synthesize<\/em><\/strong>\u00a0the basic function of generated concepts;<\/span><\/li>\n<li><span class=\"loose\"><strong><em>Evaluate<\/em><\/strong>\u00a0concepts against engineering metrics and features (and thus the customer requirements);<\/span><\/li>\n<li><span class=\"loose\"><strong><em>Select<\/em><\/strong>\u00a0a product concept to take into detailed design.<\/span><\/li>\n<\/ol>\n<h2><span style=\"color: #1b3b80;\">Evaluating Generated Concepts: How to pick the best option<\/span><\/h2>\n<ul>\n<li>Utilize the House of Quality Decision Matrix &#8211; Engineering Specifications: features, functions, and characteristics, directly linked to Customer Requirements.<\/li>\n<li>Evaluate only your top 3-4 concepts (review assignment requirements).<\/li>\n<\/ul>\n<h2><span style=\"color: #1b3b80;\">MIRE TECH Team Final Stove: An Example<\/span><\/h2>\n<p><span class=\"tight\">Let&#8217;s take a look at MIRE TECH&#8217;s Functional Analysis and Morphological Charts\/Matrices in generating their final stove design. <\/span><\/p>\n<p><span class=\"tight\">The team used <\/span><span class=\"tight\"><strong>Functional Analysis<\/strong> to determine which functions are critical for the stove to achieve the main functionality.\u00a0<\/span><\/p>\n<p><span class=\"tight\">The\u00a0<strong>functional analysis of the hex stove<\/strong> is a model that follows energy, more specifically heat, from the inputs to the outputs of the system. It is a very <\/span><span class=\"tight\">broad overview of the path the energy takes through the system but is expanded upon in greater detail in the mathematical model. The math model accounts <\/span><span class=\"tight\">for all energy changes and transfers while the functional analysis ignores all losses for simplification.<\/span><\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-96\" src=\"https:\/\/libraryresources.nse.org.ng\/wp-content\/uploads\/sites\/11\/2020\/06\/Heat-transfer-stove-diagram.png\" alt=\"A flowchart showing combustion which uses heat energy transferred to air and finally to a stove and pot to create a hot cooking surface and thermal equilibrium.\" width=\"330\" height=\"515\" srcset=\"https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2020\/06\/Heat-transfer-stove-diagram.png 392w, https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2020\/06\/Heat-transfer-stove-diagram-192x300.png 192w, https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2020\/06\/Heat-transfer-stove-diagram-65x101.png 65w, https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2020\/06\/Heat-transfer-stove-diagram-225x351.png 225w, https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2020\/06\/Heat-transfer-stove-diagram-350x546.png 350w\" sizes=\"(max-width: 330px) 100vw, 330px\" \/><\/p>\n<p><span class=\"tight\">Based on the team&#8217;s morphological charts, the top 4 designs below (Concept Selection) were brought forward:<\/span><\/p>\n<figure style=\"width: 315px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"resizable\" src=\"https:\/\/www.softchalkcloud.com\/lesson\/files\/Fr9b0A7Tw4gqB8\/paste_image2.png\" alt=\"The four concept stoves, basic sketches in pencil.\" width=\"315\" height=\"424\" longdesc=\"https:\/\/www.softchalkcloud.com\/lesson\/files\/Fr9b0A7Tw4gqB8\/ada_files\/ada_image3.html\" \/><figcaption class=\"wp-caption-text\">Stove concepts for selection &#8211; Concept 1 morphology. Options include a rocket stove, skirt stove, closed-bottom stove, and an open-bottom stove.<\/figcaption><\/figure>\n<div class=\"textbox textbox--examples\">\n<header class=\"textbox__header\">Example Exercise<\/header>\n<div class=\"textbox__content\">\n<p><span style=\"color: #1b3b80;\">Watch the interactive video below and answer the questions: HoQ w\/Decision Matrix<\/span><\/p>\n<p>The original version of this chapter contained H5P content. You may want to remove or replace this element.<\/p>\n<p><a href=\"https:\/\/libraryresources.nse.org.ng\/wp-content\/uploads\/sites\/11\/2026\/03\/House-of-Quality-with-Decision-matrix_Video-Script.pdf\">House of Quality with Decision matrix_Video Script [PDF]<\/a><\/p>\n<\/div>\n<\/div>\n<h3><span style=\"color: #1b3b80;\">Look at MIRE TECH team&#8217;s evaluation of their four top concepts:<\/span><\/h3>\n<table class=\"grid aligncenter\" style=\"width: 75%;\">\n<caption>Table 1. MIRE TECH team&#8217;s stove concepts evaluation<\/caption>\n<thead>\n<tr>\n<td style=\"text-align: center; width: 25.1451%;\"><strong><span class=\"tight\">Rocket Stove<br \/>\n<\/span><\/strong><\/td>\n<td style=\"text-align: center; width: 21.3733%;\"><strong>Skirt Stove<br \/>\n<\/strong><\/td>\n<td style=\"text-align: center; width: 28.0464%;\"><strong>Closed Bottom<\/strong><\/td>\n<td style=\"text-align: center; width: 25.4352%;\"><strong>Open Bottom<br \/>\n<\/strong><\/td>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td style=\"text-align: center; width: 25.1451%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 21.3733%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 28.0464%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 25.4352%; background-color: #fdc7c7;\">9<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center; width: 25.1451%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 21.3733%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 28.0464%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 25.4352%; background-color: #ffffe0;\">3<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center; width: 25.1451%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 21.3733%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 28.0464%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 25.4352%; background-color: #fdc7c7;\">9<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center; width: 25.1451%; background-color: #ffffe0;\">3<\/td>\n<td style=\"text-align: center; width: 21.3733%; background-color: #ffffe0;\">3<\/td>\n<td style=\"text-align: center; width: 28.0464%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 25.4352%; background-color: #fdc7c7;\">9<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center; width: 25.1451%; background-color: #ffffe0;\">3<\/td>\n<td style=\"text-align: center; width: 21.3733%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 28.0464%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 25.4352%; background-color: #fdc7c7;\">9<\/td>\n<\/tr>\n<tr>\n<td style=\"text-align: center; width: 25.1451%; background-color: #ffffe0;\">3<\/td>\n<td style=\"text-align: center; width: 21.3733%; background-color: #ffffe0;\">3<\/td>\n<td style=\"text-align: center; width: 28.0464%; background-color: #fdc7c7;\">9<\/td>\n<td style=\"text-align: center; width: 25.4352%; background-color: #fdc7c7;\">9<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>The highest scoring design is the MIRE-TECH team&#8217;s choice to move forward with, and the selected concept!<\/p>\n<p>The cut-out image below shows what the DMADVR toolbox view once it is completed in the House of Quality w\/Decision Matrix tab completed for the engineering team&#8217;s concepts. The Closed Bottom is the winner!<\/p>\n<p><img decoding=\"async\" class=\"aligncenter wp-image-97\" src=\"https:\/\/libraryresources.nse.org.ng\/wp-content\/uploads\/sites\/11\/2026\/03\/MIRE_TECH-QFD-DM.jpg\" alt=\"Concept scoring table\" width=\"456\" height=\"342\" srcset=\"https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2026\/03\/MIRE_TECH-QFD-DM.jpg 960w, https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2026\/03\/MIRE_TECH-QFD-DM-300x225.jpg 300w, https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2026\/03\/MIRE_TECH-QFD-DM-768x576.jpg 768w, https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2026\/03\/MIRE_TECH-QFD-DM-65x49.jpg 65w, https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2026\/03\/MIRE_TECH-QFD-DM-225x169.jpg 225w, https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2026\/03\/MIRE_TECH-QFD-DM-350x263.jpg 350w\" sizes=\"(max-width: 456px) 100vw, 456px\" \/><img decoding=\"async\" class=\"alignright\" style=\"margin-bottom: -1ex;\" src=\"https:\/\/www.softchalkcloud.com\/lesson\/files\/Fr9b0A7Tw4gqB8\/final%20stove.png\" alt=\"Final hex stove design\" width=\"167\" height=\"163\" \/><\/p>\n<h3><span style=\"color: #1b3b80;\">Final design: Closed Bottom (Hex Stove)<\/span><\/h3>\n<p>Though each stove was a significant improvement from a three-stone ring fire, the closed bottom design scored the highest and was chosen for development.<\/p>\n<p>The closed bottom concept is a simple design where the fire is completely contained within the stove and not burning on the ground. It is made from clay (low cost), contains all flames making it safe to use, is lightweight for portability, has minimal features for assembly, is very easy to operate, and is much more efficient than the three-stone method.<\/p>\n<figure id=\"attachment_98\" aria-describedby=\"caption-attachment-98\" style=\"width: 1562px\" class=\"wp-caption aligncenter\"><img decoding=\"async\" class=\"wp-image-98 size-full\" src=\"https:\/\/libraryresources.nse.org.ng\/wp-content\/uploads\/sites\/11\/2026\/03\/firelfly-3.jpg\" alt=\"A large table showing comparison scores for a house of quality.\" width=\"1562\" height=\"1207\" srcset=\"https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2026\/03\/firelfly-3.jpg 1562w, https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2026\/03\/firelfly-3-300x232.jpg 300w, https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2026\/03\/firelfly-3-1024x791.jpg 1024w, https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2026\/03\/firelfly-3-768x593.jpg 768w, https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2026\/03\/firelfly-3-1536x1187.jpg 1536w, https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2026\/03\/firelfly-3-65x50.jpg 65w, https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2026\/03\/firelfly-3-225x174.jpg 225w, https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2026\/03\/firelfly-3-350x270.jpg 350w\" sizes=\"(max-width: 1562px) 100vw, 1562px\" \/><figcaption id=\"caption-attachment-98\" class=\"wp-caption-text\"><a href=\"https:\/\/libraryresources.nse.org.ng\/wp-content\/uploads\/sites\/11\/2026\/03\/Firefly_HoQ-with-Decision-Matrix.pdf\">Download a pdf of the decision matrix to enlarge and review [PDF]<\/a><\/figcaption><\/figure>\n<p>This House of Quality with Decision Matrix shows the Now vs. What.\u00a0 The Now area is the current products on the market that the engineering design team has researched. The What area is what the team concepts are for solving the design need. The numbers are how both the Now products on the market and the engineering design team&#8217;s concept assessments based on the customer requirement assessment of 1, 3, 9.\u00a0 How does the team know which of their concepts is the top one or the design they are most likely to select? Well, the highest scorer is the one they need to consider as the recommended final design, and this would be the score of 2277 for the Lightning Bug Design. You can also see this in the image below. The Firefly&#8217;s design team&#8217;s final concept assessment indicates the Lightning Bug is the design they will move forward with based on an objective high score. The scoring removes subjectivity as much as possible in order to allow the team to make an objective decision based on their assessment analysis. However if the the top 2-3 designs scored within 10% of each other, the team should consider reviewing their assessment and to determine of re-scoring is needed. Another option is for teams to consider combining the best elements and then re-score to determine the best design choice with the highest score.<\/p>\n<p>See below a cut-out image of the final scoring assessment where the team has scored The Lightning Bug as the final design. This decision was based on the highest score!<\/p>\n<p><strong>Reminder:<\/strong> In ME\u00a0 270, only use 1, 3, 9\u00a0 values are used to assess within the House of Quality (HoQ\/QFD). This Firefly Team example deviates from this but it is an illustration of the process of completing a HoQ.<\/p>\n<h3><span style=\"color: #1b3b80;\">Firefly Team&#8217;s Concept Assessment:\u00a0<\/span><\/h3>\n<figure id=\"attachment_98\" aria-describedby=\"caption-attachment-98\" style=\"width: 320px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/iastate.pressbooks.pub\/app\/uploads\/sites\/33\/2020\/06\/Fire-fly.jpg\"><img decoding=\"async\" class=\"wp-image-99\" src=\"https:\/\/libraryresources.nse.org.ng\/wp-content\/uploads\/sites\/11\/2026\/03\/Fire-fly.jpg\" alt=\"A section of the concept table, including the &quot;Now versus what&quot; section.\" width=\"320\" height=\"402\" srcset=\"https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2026\/03\/Fire-fly.jpg 644w, https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2026\/03\/Fire-fly-239x300.jpg 239w, https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2026\/03\/Fire-fly-65x82.jpg 65w, https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2026\/03\/Fire-fly-225x283.jpg 225w, https:\/\/libraryresources.nse.org.ng\/me270baughman\/wp-content\/uploads\/sites\/11\/2026\/03\/Fire-fly-350x440.jpg 350w\" sizes=\"(max-width: 320px) 100vw, 320px\" \/><\/a><figcaption id=\"caption-attachment-98\" class=\"wp-caption-text\">Click on the image to enlarge and review<\/figcaption><\/figure>\n<p>The original version of this chapter contained H5P content. 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