{"id":4600,"date":"2026-09-27T18:32:34","date_gmt":"2026-09-27T18:32:34","guid":{"rendered":"https:\/\/www.equitas-consulting.com\/"},"modified":"2026-09-27T19:21:59","modified_gmt":"2026-09-27T19:21:59","slug":"kuantum-konusunda-uzman-tanik","status":"publish","type":"page","link":"https:\/\/www.equitas-consulting.com\/tr\/kuantum-konusunda-uzman-tanik\/","title":{"rendered":"Hesap (Quantum) Uzman Tan\u0131\u011f\u0131"},"content":{"rendered":"\n<!--\n  EQUITAS \u2013 Quantum Expert Witness page  (\/quantum-expert-witness\/)\n  Rank Math title:       Quantum Expert Witness \u2014 Construction Disputes | Equitas\n  Rank Math description: Independent quantum expert witness for construction arbitration, adjudication and litigation: prolongation, disruption, variations and termination accounts.\n-->\n<link rel=\"preconnect\" href=\"https:\/\/fonts.googleapis.com\">\n<link rel=\"preconnect\" href=\"https:\/\/fonts.gstatic.com\" crossorigin>\n<link rel=\"stylesheet\" href=\"https:\/\/fonts.googleapis.com\/css2?family=Cormorant+Garamond:ital,wght@0,400;0,500;0,600;1,400;1,500&#038;family=DM+Sans:wght@300;400;500&#038;display=swap\">\n<style>\n\/* ===== EQUITAS EXPERT SERVICES PAGE \u2014 SELF CONTAINED ===== *\/\n\n.eq-expert {\n  --terra:       #C45A10;\n  --terra-light: #D97035;\n  --slate:       #1C2B2B;\n  --slate-mid:   #2A3D3D;\n  --slate-panel: #132022;\n  --off-white:   #F6F3EE;\n  --white:       #FFFFFF;\n  --ink:         #182426;\n  --ink-soft:    #3A4040;\n  --muted:       #7A8A8A;\n  --line:        rgba(196,90,16,0.12);\n  --max:         1320px;\n  font-family: 'DM Sans', sans-serif;\n  color: var(--ink-soft);\n  overflow-x: hidden;\n}\n\n.eq-expert *, .eq-expert *::before, .eq-expert *::after {\n  box-sizing: border-box;\n}\n\n.eq-expert a { color: inherit; 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}\n}\n<\/style>\n<style>\n.eq-faq{--terra:#C45A10;--terra-light:#D97035;--ink:#182426;--ink-soft:#3A4040;--muted:#7A8A8A;--off-white:#F6F3EE;\n  background:var(--off-white);padding:60px 0;font-family:'DM Sans',sans-serif;color:var(--ink-soft);}\n.eq-faq *{box-sizing:border-box;}\n.eq-faq .faq-wrap{width:min(1100px,calc(100% - 80px));margin:0 auto;}\n.eq-faq .eyebrow{display:inline-flex;align-items:center;gap:12px;font-size:11px;letter-spacing:.22em;text-transform:uppercase;color:var(--terra-light);}\n.eq-faq .eyebrow::before{content:\"\";width:30px;height:1px;background:var(--terra);}\n.eq-faq h2{font-family:'Cormorant Garamond',serif;font-weight:500;font-size:clamp(2rem,4vw,3.2rem);line-height:1.05;color:var(--ink);margin:1rem 0 2rem;}\n.eq-faq h2 em{font-style:italic;color:#5f6d70;}\n.eq-faq details{background:#fff;border-left:3px solid transparent;margin-bottom:1px;transition:border-color .2s;}\n.eq-faq details[open]{border-left-color:var(--terra);}\n.eq-faq summary{list-style:none;cursor:pointer;padding:22px 56px 22px 28px;position:relative;font-family:'Cormorant Garamond',serif;font-size:1.25rem;font-weight:500;line-height:1.3;color:var(--ink);}\n.eq-faq summary::-webkit-details-marker{display:none;}\n.eq-faq summary::after{content:\"+\";position:absolute;right:28px;top:50%;transform:translateY(-50%);font-family:'DM Sans',sans-serif;font-size:1.4rem;font-weight:300;color:var(--terra);}\n.eq-faq details[open] summary::after{content:\"\\2212\";}\n.eq-faq .faq-a{padding:0 28px 24px;font-size:.92rem;line-height:1.85;font-weight:300;max-width:820px;}\n@media(max-width:768px){.eq-faq .faq-wrap{width:calc(100% - 32px);}.eq-faq summary{padding:18px 48px 18px 20px;font-size:1.1rem;}.eq-faq .faq-a{padding:0 20px 20px;}}\n<\/style>\n\n<div class=\"eq-expert\">\n\n<!-- HERO -->\n<header class=\"hero\">\n  <div class=\"hero-accent-bar\"><\/div>\n  <div class=\"container hero-content\">\n    <div>\n      <div class=\"eyebrow\">Quantum Expert Witness<\/div>\n      <h1>Quantum expert witness<br>for <em>construction disputes<\/em><\/h1>\n      <p class=\"hero-copy\">Independent quantum expert evidence for international arbitration, adjudication, dispute board proceedings and litigation on construction and engineering projects \u2014 prolongation, disruption, acceleration, variations, termination accounts and damages.<\/p>\n    <\/div>\n    <div class=\"hero-card\">\n      <div class=\"hero-card-label\">Quantum expert credentials<\/div>\n      <div class=\"credential-list\">\n        <div class=\"credential-item\">Quantum expert appointments in arbitration, DAB and settlement proceedings<\/div>\n        <div class=\"credential-item\">Cross-examined in arbitral proceedings<\/div>\n        <div class=\"credential-item\">Concurrent evidence (hot-tubbing) experience<\/div>\n        <div class=\"credential-item\">Member, Academy of Experts<\/div>\n        <div class=\"credential-item\">Chartered Civil Engineer \u00b7 LLM Construction Law &amp; Arbitration<\/div>\n        <div class=\"credential-item\">Experience across 29 jurisdictions<\/div>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/header>\n\n<!-- OVERVIEW -->\n<section class=\"overview-section\">\n  <div class=\"container\">\n    <div class=\"eyebrow\">Overview<\/div>\n    <h2 class=\"section-title\" style=\"margin-top:1rem;\">Quantum evidence built on<br><em>entitlement and records<\/em><\/h2>\n    <div class=\"overview-grid\">\n      <div class=\"overview-panel\">\n        <p>In construction disputes the quantum case is only as strong as its link to entitlement and to the project cost record. Tribunals are increasingly unwilling to accept global or formula-driven valuations where the records could have supported a more direct assessment. Our quantum evidence is built to meet that standard.<\/p>\n        <p>Every head of claim is traced from the contractual basis of recovery, through the cause, to the cost actually incurred or reasonably assessed. Where quantum depends on time, it is tied to the delay analysis \u2014 so the tribunal can see why each amount follows from each event. See also our <a href=\"\/delay-expert-witness\/\" style=\"color:var(--terra);\">delay expert witness<\/a> services.<\/p>\n        <p>Quantum expert work is led by Metehan \u00c7a\u011flar Sonbahar, a Chartered Civil Engineer with an LLM in Construction Law and Arbitration, who has given expert evidence before the ICC, LCIA, DIAC, ISTAC, ICSID, ITOTAM, DIFC, under the UNCITRAL Rules and in adjudication.<\/p>\n      <\/div>\n      <div class=\"quote-panel\">\n        <span class=\"label\">Our Position<\/span>\n        <blockquote>&quot;A quantum figure that cannot be traced back to its cause is a number, not evidence.&quot;<\/blockquote>\n        <p>We value what the records and the contract support. Where a claimed amount cannot be sustained, we say so early \u2014 before it is tested in cross-examination.<\/p>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<!-- SCOPE -->\n<section class=\"services-section\">\n  <div class=\"container\">\n    <div class=\"eyebrow\">Scope<\/div>\n    <h2 class=\"section-title\" style=\"margin-top:1rem;\">Heads of claim<br><em>we assess<\/em><\/h2>\n    <p class=\"section-intro\">We act for claimants and respondents, and as single joint or tribunal-appointed expert where required.<\/p>\n    <div class=\"services-grid\">\n      <div class=\"service-card\">\n        <div class=\"service-icon\">P<\/div>\n        <h3 class=\"service-title\">Prolongation and time-related costs<\/h3>\n        <p class=\"service-desc\">Site overheads, preliminaries, extended plant and staff, and head office overheads \u2014 assessed from actual cost where records allow, with formula approaches (Hudson, Emden, Eichleay) applied and tested only where appropriate.<\/p>\n      <\/div>\n      <div class=\"service-card\">\n        <div class=\"service-icon\">D<\/div>\n        <h3 class=\"service-title\">Disruption and loss of productivity<\/h3>\n        <p class=\"service-desc\">Quantification of lost productivity using measured-mile, earned value and other recognised methods, tested against the records for a genuine causal link.<\/p>\n      <\/div>\n      <div class=\"service-card\">\n        <div class=\"service-icon\">A<\/div>\n        <h3 class=\"service-title\">Acceleration<\/h3>\n        <p class=\"service-desc\">Valuation of instructed and constructive acceleration, including the recoverability of acceleration costs where extensions of time were wrongly refused.<\/p>\n      <\/div>\n      <div class=\"service-card\">\n        <div class=\"service-icon\">V<\/div>\n        <h3 class=\"service-title\">Variations and remeasurement<\/h3>\n        <p class=\"service-desc\">Valuation of variations, remeasured quantities, rates and prices, cost-plus evaluations and increased costs under FIDIC and bespoke contracts.<\/p>\n      <\/div>\n      <div class=\"service-card\">\n        <div class=\"service-icon\">T<\/div>\n        <h3 class=\"service-title\">Termination accounts and damages<\/h3>\n        <p class=\"service-desc\">Final accounts, termination valuations, loss of profit and damages for breach, including counterclaims for defects and completion costs.<\/p>\n      <\/div>\n      <div class=\"service-card\">\n        <div class=\"service-icon\">R<\/div>\n        <h3 class=\"service-title\">Review of opposing quantum evidence<\/h3>\n        <p class=\"service-desc\">Critical review of the other side&#x27;s quantum report, joint statement preparation, and support to counsel on cross-examination.<\/p>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<!-- REPRESENTATIVE MATTERS -->\n<section class=\"services-section\" style=\"background:var(--off-white);\">\n  <div class=\"container\">\n    <div class=\"eyebrow\">Representative Matters<\/div>\n    <h2 class=\"section-title\" style=\"margin-top:1rem;\">Selected quantum<br><em>expert appointments<\/em><\/h2>\n    <p class=\"section-intro\">Client names and details are withheld for confidentiality. Further representative matters are shown on our <a href=\"\/experience\/\" style=\"color:var(--terra);\">Experience<\/a> page.<\/p>\n    <div class=\"services-grid\">\n      <div class=\"service-card\">\n        <div class=\"service-icon\">W<\/div>\n        <h3 class=\"service-title\">Wastewater line and treatment plant \u2014 Middle East<\/h3>\n        <p class=\"service-desc\">Quantum expert on claims involving variations, remeasurement, cost-plus evaluation, prolongation, preliminaries, increased costs and breach of contract under a FIDIC-based contract.<\/p>\n      <\/div>\n      <div class=\"service-card\">\n        <div class=\"service-icon\">H<\/div>\n        <h3 class=\"service-title\">304 km highway \u2014 CIS<\/h3>\n        <p class=\"service-desc\">Programming and quantum expert in DAB proceedings on an ADB and World Bank-financed highway for an ENR-listed contractor joint venture, with continuing support in the ICC arbitration that followed.<\/p>\n      <\/div>\n      <div class=\"service-card\">\n        <div class=\"service-icon\">E<\/div>\n        <h3 class=\"service-title\">112 km highway \u2014 East Africa<\/h3>\n        <p class=\"service-desc\">Delay and cost expert on an Islamic Development Bank-funded greenfield road project under the FIDIC Pink Book (2010).<\/p>\n      <\/div>\n      <div class=\"service-card\">\n        <div class=\"service-icon\">O<\/div>\n        <h3 class=\"service-title\">Oil processing facility \u2014 Eastern Europe<\/h3>\n        <p class=\"service-desc\">Independent expert opinion on defects, costs and damages prepared during an amicable settlement process.<\/p>\n      <\/div>\n      <div class=\"service-card\">\n        <div class=\"service-icon\">P<\/div>\n        <h3 class=\"service-title\">Port extension project \u2014 European Union<\/h3>\n        <p class=\"service-desc\">Appointed by the Contractor to analyse and value cost and variation claims on a port extension project in the European Union.<\/p>\n      <\/div>\n      <div class=\"service-card\">\n        <div class=\"service-icon\">S<\/div>\n        <h3 class=\"service-title\">Hydroelectric power station \u2014 T\u00fcrkiye<\/h3>\n        <p class=\"service-desc\">Appointed by the contracting party to provide an independent opinion on cost and variation claims during a formal dispute resolution process on a hydroelectric power station project.<\/p>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n<!-- FORUMS -->\n<div class=\"forums-section\">\n  <div class=\"container\">\n    <div class=\"forums-label\">Expert experience across major international dispute resolution forums<\/div>\n    <div class=\"forums-grid\">\n      <div class=\"forum\">\n        <strong><a href=\"https:\/\/iccwbo.org\" target=\"_blank\" rel=\"noopener\" style=\"color:inherit;\">ICC<\/a><\/strong>\n        <span>International Chamber of Commerce<\/span>\n      <\/div>\n      <div class=\"forum\">\n        <strong><a href=\"https:\/\/www.lcia.org\" target=\"_blank\" rel=\"noopener\" style=\"color:inherit;\">LCIA<\/a><\/strong>\n        <span>London Court of International Arbitration<\/span>\n      <\/div>\n      <div class=\"forum\">\n        <strong><a href=\"https:\/\/www.diac.ae\" target=\"_blank\" rel=\"noopener\" style=\"color:inherit;\">DIAC<\/a><\/strong>\n        <span>Dubai International Arbitration Centre<\/span>\n      <\/div>\n      <div class=\"forum\">\n        <strong><a href=\"https:\/\/www.istac.org.tr\" target=\"_blank\" rel=\"noopener\" style=\"color:inherit;\">ISTAC<\/a><\/strong>\n        <span>Istanbul Arbitration Centre<\/span>\n      <\/div>\n      <div class=\"forum\">\n        <strong><a href=\"https:\/\/icsid.worldbank.org\" target=\"_blank\" rel=\"noopener\" style=\"color:inherit;\">ICSID<\/a><\/strong>\n        <span>World Bank Arbitration Centre<\/span>\n      <\/div>\n    <\/div>\n    <div class=\"forums-grid-2\">\n      <div class=\"forum\">\n        <strong>ITOTAM<\/strong>\n        <span>Istanbul Technical University Arbitration Centre<\/span>\n      <\/div>\n      <div class=\"forum\">\n        <strong>DIFC<\/strong>\n        <span>Dubai International Financial Centre Courts<\/span>\n      <\/div>\n      <div class=\"forum\">\n        <strong>UNCITRAL<\/strong>\n        <span>UN Commission on International Trade Law<\/span>\n      <\/div>\n      <div class=\"forum\">\n        <strong>Adjudication<\/strong>\n        <span>Domestic &#038; contractual adjudication proceedings<\/span>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/div>\n\n<!-- CREDENTIALS -->\n<section class=\"credentials-section\">\n  <div class=\"container\">\n    <div class=\"eyebrow\">Credentials<\/div>\n    <h2 class=\"section-title\" style=\"margin-top:1rem;\">Professional qualifications<br><em>underpinning our expert work<\/em><\/h2>\n    <p class=\"section-intro\">Our expert services are led by a practitioner whose qualifications span both the technical and legal dimensions of construction disputes.<\/p>\n\n    <div class=\"credentials-grid\">\n      <div class=\"credential-card\">\n        <div class=\"credential-code\">CEng<\/div>\n        <div class=\"credential-name\">Chartered Civil Engineer<\/div>\n        <p class=\"credential-desc\">Technical foundation across construction, engineering and infrastructure projects \u2014 providing the project knowledge that underpins delay and quantum analysis.<\/p>\n      <\/div>\n      <div class=\"credential-card\">\n        <div class=\"credential-code\">LLM<\/div>\n        <div class=\"credential-name\">Construction Law &#038; Arbitration<\/div>\n        <p class=\"credential-desc\">Postgraduate legal qualification in construction law and arbitration \u2014 bridging the technical and legal dimensions of construction disputes.<\/p>\n      <\/div>\n      <div class=\"credential-card\">\n        <div class=\"credential-code\">CIArb<\/div>\n        <div class=\"credential-name\">Chartered Institute of Arbitrators<\/div>\n        <p class=\"credential-desc\">Membership of the global centre for dispute resolution practice, reflecting engagement with recognised standards in arbitration.<\/p>\n      <\/div>\n      <div class=\"credential-card\">\n        <div class=\"credential-code\">AoE<\/div>\n        <div class=\"credential-name\">Academy of Experts<\/div>\n        <p class=\"credential-desc\">Member of the Academy of Experts \u2014 the UK&#8217;s leading professional body for expert witnesses, focused on standards and responsibilities of expert practice.<\/p>\n      <\/div>\n      <div class=\"credential-card\">\n        <div class=\"credential-code\">MSc<\/div>\n        <div class=\"credential-name\">Construction Management<\/div>\n        <p class=\"credential-desc\">Postgraduate qualification in construction management providing the project delivery context essential for credible delay and quantum analysis.<\/p>\n      <\/div>\n      <div class=\"credential-card\">\n        <div class=\"credential-code\">FIDIC<\/div>\n        <div class=\"credential-name\">FIDIC Certified Adjudicator<\/div>\n        <p class=\"credential-desc\">Recognised specialist in FIDIC contracts and dispute resolution, including appointments as DAB member under the FIDIC suite.<\/p>\n      <\/div>\n    <\/div>\n  <\/div>\n<\/section>\n\n\n<!-- FAQ -->\n<section class=\"eq-faq\">\n  <div class=\"faq-wrap\">\n    <div class=\"eyebrow\">Common Questions<\/div>\n    <h2>Quantum expert witness \u2014 <em>common questions<\/em><\/h2>\n      <details>\n        <summary>What does a quantum expert witness do in a construction dispute?<\/summary>\n        <div class=\"faq-a\"><p>A quantum expert gives an independent opinion to the tribunal or court on the value of the claims and counterclaims \u2014 for example prolongation costs, disruption, variations or damages. The expert does not decide entitlement; the opinion typically values the claim on each alternative basis the tribunal may find.<\/p><\/div>\n      <\/details>\n      <details>\n        <summary>Do you act for claimants and respondents?<\/summary>\n        <div class=\"faq-a\"><p>Yes. Equitas acts for contractors, employers and other parties on both sides of construction disputes, and can act as single joint or tribunal-appointed expert where the parties or tribunal require.<\/p><\/div>\n      <\/details>\n      <details>\n        <summary>Can you review the other side&#x27;s quantum report?<\/summary>\n        <div class=\"faq-a\"><p>Yes. We review opposing quantum evidence for methodological errors, duplication, unsupported assumptions and gaps in the cost record, and support counsel in preparing cross-examination.<\/p><\/div>\n      <\/details>\n      <details>\n        <summary>When should a quantum expert be appointed?<\/summary>\n        <div class=\"faq-a\"><p>Ideally before pleadings are finalised. Early input shapes how the claim is pleaded and which records are gathered, and avoids a quantum case that cannot later be supported by expert evidence.<\/p><\/div>\n      <\/details>\n  <\/div>\n<\/section>\n\n<!-- CTA -->\n<div class=\"cta-section\">\n  <div class=\"container\">\n    <div class=\"cta-inner\">\n      <div>\n        <h2>Need a quantum expert for a construction dispute?<\/h2>\n        <p>Contact Equitas to discuss the matter, the forum and the timetable. Initial discussions are confidential.<\/p>\n      <\/div>\n      <a href=\"\/contact\/\" class=\"btn-dark\">Get in Touch<\/a>\n    <\/div>\n  <\/div>\n<\/div>\n\n<\/div><!-- end .eq-expert -->\n\n<script type=\"application\/ld+json\">\n[\n  {\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"Service\",\n    \"name\": \"Quantum Expert Witness\",\n    \"serviceType\": \"Expert Witness\",\n    \"description\": \"Independent quantum expert witness for construction arbitration, adjudication and litigation: prolongation, disruption, variations and termination accounts.\",\n    \"url\": \"https:\/\/www.equitas-consulting.com\/quantum-expert-witness\/\",\n    \"areaServed\": \"Worldwide\",\n    \"provider\": {\n      \"@type\": \"ProfessionalService\",\n      \"name\": \"Equitas Consulting\",\n      \"url\": \"https:\/\/www.equitas-consulting.com\/\",\n      \"employee\": {\n        \"@type\": \"Person\",\n        \"name\": \"Metehan \u00c7a\u011flar Sonbahar\",\n        \"jobTitle\": \"Delay and Quantum Expert Witness\"\n      }\n    }\n  },\n  {\n    \"@context\": \"https:\/\/schema.org\",\n    \"@type\": \"FAQPage\",\n    \"mainEntity\": [\n      {\n        \"@type\": \"Question\",\n        \"name\": \"What does a quantum expert witness do in a construction dispute?\",\n        \"acceptedAnswer\": {\n          \"@type\": \"Answer\",\n          \"text\": \"A quantum expert gives an independent opinion to the tribunal or court on the value of the claims and counterclaims \u2014 for example prolongation costs, disruption, variations or damages. 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