{"id":2159,"date":"2025-11-13T09:51:49","date_gmt":"2025-11-13T09:51:49","guid":{"rendered":"https:\/\/www.megabytecircuit.com\/blog\/?p=2159"},"modified":"2025-11-24T10:00:21","modified_gmt":"2025-11-24T10:00:21","slug":"5-common-pcb-layout-design-mistakes","status":"publish","type":"post","link":"https:\/\/www.megabytecircuit.com\/blog\/5-common-pcb-layout-design-mistakes\/","title":{"rendered":"5 Common PCB Layout Design Mistakes (And How to Avoid Them)"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"2159\" class=\"elementor elementor-2159\">\n\t\t\t\t<div class=\"elementor-element elementor-element-581ac0a e-flex e-con-boxed e-con e-parent\" data-id=\"581ac0a\" data-element_type=\"container\" data-settings=\"{&quot;background_background&quot;:&quot;classic&quot;}\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t<div class=\"elementor-element elementor-element-0945b57 e-con-full e-flex e-con e-child\" data-id=\"0945b57\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-e71d136 elementor-widget elementor-widget-heading\" data-id=\"e71d136\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h1 class=\"elementor-heading-title elementor-size-default\">5 Common PCB Layout Design Mistakes (And How to Avoid Them)<\/h1>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-4d86734 elementor-widget elementor-widget-text-editor\" data-id=\"4d86734\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Designing a Printed Circuit Board (PCB) is a meticulous process that directly impacts the performance, reliability, and manufacturability of your electronic product. A well-executed layout ensures signal integrity, thermal management, and mechanical stability while a poorly designed board can lead to costly rework, field failures, or even product recalls. In this comprehensive guide, we expose the five most common PCB layout design mistakes engineers make and how to avoid them so you can deliver reliable, high-performing electronics every time.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-b2410a3 elementor-widget elementor-widget-heading\" data-id=\"b2410a3\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Mistake 1: Poor Thermal Management<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a13d94b elementor-widget elementor-widget-text-editor\" data-id=\"a13d94b\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><b>Problem<\/b><span style=\"font-weight: 400;\">: Overheating components, reduced lifespan, or even board delamination due to uneven temperature distribution.<\/span><span style=\"font-weight: 400;\"><br \/><\/span> <b>Solution<\/b><span style=\"font-weight: 400;\">:<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Use thermal vias<\/b><span style=\"font-weight: 400;\">: These small holes filled with a conductive material help dissipate heat from hot spots, such as power ICs or FETs, to the rest of the board.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Route high-current traces away from sensitive components<\/b><span style=\"font-weight: 400;\">: Heat generated by high-current paths can affect nearby passive components or signal integrity.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Add heat sinks or thermal pads<\/b><span style=\"font-weight: 400;\">: For high-power components, adding heat sinks or thermal pads can significantly reduce operating temperatures.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Simulate thermal performance<\/b><span style=\"font-weight: 400;\">: Tools like ANSYS Icepak or Mentor Graphics\u2019 T-Engineer can model thermal behavior, helping you identify hot spots before production.<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">At Megabytes Circuit Systems, we use thermal simulation to ensure your board stays within safe operating temperatures preventing costly rework and field failures. Our team combines expertise with advanced tools to optimize your thermal management strategy, ensuring your design meets both performance and safety standards.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-3d7b8e5 elementor-widget elementor-widget-heading\" data-id=\"3d7b8e5\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Mistake 2: Signal Interference<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-17e83c4 elementor-widget elementor-widget-text-editor\" data-id=\"17e83c4\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><b>Problem<\/b><span style=\"font-weight: 400;\">: Crosstalk, ringing, or noise on sensitive analog or digital signals, leading to data corruption or functional failures.<\/span><span style=\"font-weight: 400;\"><br \/><\/span> <b>Solution<\/b><span style=\"font-weight: 400;\">:<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Separate analog and digital ground planes with guard rings<\/b><span style=\"font-weight: 400;\">: This prevents noise from one section of the board affecting another.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Route high-speed signals in controlled impedance traces<\/b><span style=\"font-weight: 400;\">: Use your design software to calculate and enforce the correct trace width and spacing for high-speed signals.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Add shielding or guard traces around sensitive signals<\/b><span style=\"font-weight: 400;\">: These can help block interference from nearby high-speed or high-power traces.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Use differential signaling for critical data lines<\/b><span style=\"font-weight: 400;\">: This technique involves transmitting data on two wires, which cancels out noise and improves signal integrity.<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">Our engineers at Megabytes Circuit Systems work with you to optimize your layout for signal integrity ensuring your board meets performance specifications. We leverage our experience and tools to identify and mitigate potential signal interference issues, ensuring your electronic product remains reliable under all conditions.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-2f634f3 elementor-widget elementor-widget-heading\" data-id=\"2f634f3\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Mistake 3: Insufficient Routing Space<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-a8278d0 elementor-widget elementor-widget-text-editor\" data-id=\"a8278d0\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><b>Problem<\/b><span style=\"font-weight: 400;\">: Overcrowded traces, poor trace width control, or insufficient clearance between conductors, leading to manufacturing defects or electrical shorts.<\/span><span style=\"font-weight: 400;\"><br \/><\/span> <b>Solution<\/b><span style=\"font-weight: 400;\">:<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Follow IPC-2221 spacing and trace width guidelines<\/b><span style=\"font-weight: 400;\">: These standards ensure your traces have adequate spacing and width for reliable manufacturing.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Use 45-degree routing for signal paths<\/b><span style=\"font-weight: 400;\">: This technique reduces cross-sectional area and helps distribute current more evenly.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Reserve space for future design changes or revisions<\/b><span style=\"font-weight: 400;\">: Allowing for future modifications can save time and money in redesigning the board.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Prioritize critical signals and power planes in routing<\/b><span style=\"font-weight: 400;\">: Ensure that high-speed signals and power distribution paths have the necessary space and routing priority.<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">With our <\/span><a href=\"https:\/\/www.megabytecircuit.com\/design-for-manufacturability-dfm-support.html\"><span style=\"font-weight: 400;\">Design for Manufacturability (DFM)<\/span><\/a><span style=\"font-weight: 400;\"> review process, we ensure your layout meets manufacturing requirements eliminating costly design changes later. Our team at Megabytes Circuit Systems offers a comprehensive DFM review, identifying any potential issues early in the design phase.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8a620ea elementor-widget elementor-widget-heading\" data-id=\"8a620ea\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Mistake 4: Poor Power Distribution<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-1599b8d elementor-widget elementor-widget-text-editor\" data-id=\"1599b8d\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><b>Problem<\/b><span style=\"font-weight: 400;\">: Voltage drops, current surges, or inadequate decoupling leading to instability, noise, or functional failures.<\/span><span style=\"font-weight: 400;\"><br \/><\/span> <b>Solution<\/b><span style=\"font-weight: 400;\">:<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Use multiple decoupling capacitors near power pins<\/b><span style=\"font-weight: 400;\">: These capacitors stabilize voltage fluctuations and filter out noise.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Route power planes close to high-current components<\/b><span style=\"font-weight: 400;\">: This reduces resistance and inductance, ensuring stable power delivery.<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Add ferrite beads or inductors to filter noise<\/b><span style=\"font-weight: 400;\">: These components can significantly reduce electromagnetic interference (EMI).<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>Use star or mesh grounding for power distribution<\/b><span style=\"font-weight: 400;\">: This technique provides a low-impedance path for current return, improving stability.<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">Our team helps you optimize your power distribution network ensuring stable operation under all conditions. By integrating best practices for power distribution, we ensure your PCB layout design meets both performance and reliability requirements.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-779a796 elementor-widget elementor-widget-heading\" data-id=\"779a796\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Mistake 5: Ignoring Design for Manufacturability (DFM)<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-6d281de elementor-widget elementor-widget-text-editor\" data-id=\"6d281de\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">Assembly is only half the battle. Testing ensures your board actually works.<\/span><\/p><p><span style=\"font-weight: 400;\">A robust provider will include:<\/span><\/p><ul><li style=\"font-weight: 400;\" aria-level=\"1\"><b>AOI<\/b><span style=\"font-weight: 400;\">: Automated detection of solder bridges, missing components, or polarity errors<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>X-ray<\/b><span style=\"font-weight: 400;\">: Essential for hidden joints under BGAs and CSPs<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>ICT<\/b><span style=\"font-weight: 400;\">: Verifies electrical continuity and component values<\/span><\/li><li style=\"font-weight: 400;\" aria-level=\"1\"><b>FCT<\/b><span style=\"font-weight: 400;\">: Simulates real-world operation under load<\/span><\/li><\/ul><p><span style=\"font-weight: 400;\">We integrate AOI and X-ray into every production batch, and offer optional ICT and FCT with full test reports. Our defect rate for mass production remains below 0.1% a result of layered quality controls, not luck.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-673bc63 elementor-widget elementor-widget-heading\" data-id=\"673bc63\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Pro Tip: Avoiding Mistakes Starts with Expert Guidance<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-dbf27fc elementor-widget elementor-widget-image\" data-id=\"dbf27fc\" data-element_type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"1408\" height=\"768\" src=\"https:\/\/www.megabytecircuit.com\/blog\/wp-content\/uploads\/2025\/11\/nov_blog_3.2.png\" class=\"attachment-full size-full wp-image-2160\" alt=\"PCB Layout common mistakes avoiding\" srcset=\"https:\/\/www.megabytecircuit.com\/blog\/wp-content\/uploads\/2025\/11\/nov_blog_3.2.png 1408w, https:\/\/www.megabytecircuit.com\/blog\/wp-content\/uploads\/2025\/11\/nov_blog_3.2-300x164.png 300w, https:\/\/www.megabytecircuit.com\/blog\/wp-content\/uploads\/2025\/11\/nov_blog_3.2-1024x559.png 1024w, https:\/\/www.megabytecircuit.com\/blog\/wp-content\/uploads\/2025\/11\/nov_blog_3.2-768x419.png 768w, https:\/\/www.megabytecircuit.com\/blog\/wp-content\/uploads\/2025\/11\/nov_blog_3.2-1200x655.png 1200w\" sizes=\"(max-width: 1408px) 100vw, 1408px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-742ddcf elementor-widget elementor-widget-text-editor\" data-id=\"742ddcf\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><span style=\"font-weight: 400;\">While this article highlights five common PCB layout design mistakes, there are countless other pitfalls to avoid. To ensure your board is free from errors and ready for production, consider partnering with a trusted PCB design and manufacturing partner like Megabytes Circuit Systems.<\/span><\/p><p><span style=\"font-weight: 400;\">Our team of experienced engineers works with you to optimize your layout for performance, manufacturability, and cost so you can focus on what you do best: innovating and delivering. From initial design review to final product delivery, we\u2019re here to support you every step of the way.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-e39723e elementor-widget elementor-widget-heading\" data-id=\"e39723e\" data-element_type=\"widget\" data-widget_type=\"heading.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t<h2 class=\"elementor-heading-title elementor-size-default\">Ready to design a reliable, high-performing PCB layout?<\/h2>\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-8b3f1c3 elementor-widget elementor-widget-text-editor\" data-id=\"8b3f1c3\" data-element_type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p><a href=\"https:\/\/www.megabytecircuit.com\/contact.html\"><span style=\"font-weight: 400;\">Contact Megabytes Circuit Systems<\/span><\/a><span style=\"font-weight: 400;\"> today for a free DFM review, competitive quote, and personalized consultation. We\u2019re here to ensure your board meets all your technical, manufacturing, and budgetary requirements so you can bring your product to market with confidence.<\/span><\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t<div class=\"elementor-element elementor-element-c3d6234 e-con-full e-flex e-con e-child\" data-id=\"c3d6234\" data-element_type=\"container\">\n\t\t\t\t<div class=\"elementor-element elementor-element-2406c76 elementor-widget elementor-widget-shortcode\" data-id=\"2406c76\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-shortcode\">        <div class=\"recent-posts-container\">\n            <h2 class=\"recent-posts-title\">Recent Posts<\/h2>\n                            <div class=\"recent-post-item\">\n                                            <span class=\"recent-post-category\">PCB Guide<\/span>\n                                        <a href=\"https:\/\/www.megabytecircuit.com\/blog\/top-pcb-board-manufacturers-india\/\" class=\"recent-post-link\">How to Pick the Best PCB Board Manufacturers in India for Your Project<\/a>\n                <\/div>\n                            <div class=\"recent-post-item\">\n                                            <span class=\"recent-post-category\">PCB Guide<\/span>\n                                        <a href=\"https:\/\/www.megabytecircuit.com\/blog\/single-layer-pcb-design-guide-optimization\/\" class=\"recent-post-link\">The Complete Guide to Single Layer PCB Design and Manufacturing<\/a>\n                <\/div>\n                            <div class=\"recent-post-item\">\n                                            <span class=\"recent-post-category\">PCB Guide<\/span>\n                                        <a href=\"https:\/\/www.megabytecircuit.com\/blog\/pcb-company-india-cost-quality-guide\/\" class=\"recent-post-link\">Why a PCB Company in India Offers the Best Value for Global Buyers<\/a>\n                <\/div>\n                            <div class=\"recent-post-item\">\n                                            <span class=\"recent-post-category\">PCB Guide<\/span>\n                                        <a href=\"https:\/\/www.megabytecircuit.com\/blog\/choose-pcb-circuit-board-manufacturer-high-volume\/\" class=\"recent-post-link\">How to Select a Trusted PCB Circuit Board Manufacturer<\/a>\n                <\/div>\n                            <div class=\"recent-post-item\">\n                                            <span class=\"recent-post-category\">PCB Guide<\/span>\n                                        <a href=\"https:\/\/www.megabytecircuit.com\/blog\/circuit-board-manufacturer-in-india-buyer-guide\/\" class=\"recent-post-link\">Circuit Board Manufacturer in India: Complete Buyer Guide (2026)<\/a>\n                <\/div>\n                    <\/div>\n        <\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-d9ae7e7 elementor-widget elementor-widget-shortcode\" data-id=\"d9ae7e7\" data-element_type=\"widget\" data-widget_type=\"shortcode.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t<div class=\"elementor-shortcode\">    <div class=\"our_product_main_wrapper\">\n        <h3>Our Product<\/h3>\n        <div class=\"our-product-group-wrapper\">\n            <ul>\n                <li>\n                    <a href=\"https:\/\/www.megabytecircuit.com\/products\/single-layer-pcb.html\">Single Layer PCB<\/a>\n                <\/li>\n                <li>\n                    <a href=\"https:\/\/www.megabytecircuit.com\/products\/double-layer-pcb.html\">Double Layer PCB<\/a>\n                <\/li>\n                <li>\n                    <a href=\"https:\/\/www.megabytecircuit.com\/products\/multi-layer-pcb.html\">Multi Layer PCB<\/a>\n                <\/li>\n            <\/ul>\n        <\/div>\n    <\/div>\n    <\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Designing a Printed Circuit Board (PCB) is a meticulous process that directly impacts the performance, reliability, and manufacturability of your electronic product. A well-executed layout ensures signal integrity, thermal management, and mechanical stability while a poorly designed board can lead to costly rework, field failures, or even product recalls. In this comprehensive guide, we expose the five most common PCB layout design mistakes engineers make and how to avoid them so you can deliver reliable, high-performing electronics every time.<\/p>\n","protected":false},"author":1,"featured_media":2161,"comment_status":"open","ping_status":"open","sticky":false,"template":"elementor_header_footer","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-2159","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-pcb-guide"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>5 Common PCB Layout Design Mistakes (And How to Avoid Them)<\/title>\n<meta name=\"description\" content=\"Avoid these 5 costly PCB layout design mistakes poor thermal management, signal interference, and more with Megabytes Circuit Systems&#039; expert guidance.\" \/>\n<meta name=\"robots\" content=\"index, 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