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The doctrines Delaware courts name when they cite: mined from the sentence each citation lives in, keyed on the citing court, counted by distinct opinions. Entry by issue, not by case: pick one to see the cases on each side.
| # | Issue | Most-cited case | Opinions | Courts | Years | Last 5y |
|---|---|---|---|---|---|---|
| 1 | business judgment rule | Aronson v. Lewis | 456 | 3 | 1969–2026 | 129 |
| 2 | plain error | Wainwright v. State | 216 | 3 | 1925–2026 | 69 |
| 3 | fairness standard | Weinberger v. UOP, Inc. | 214 | 3 | 1969–2026 | 71 |
| 4 | ineffective assistance of counsel claim | Strickland v. Washington | 205 | 2 | 1990–2026 | 81 |
| 5 | affirmative defense | Reid v. Spazio | 200 | 3 | 1961–2026 | 97 |
| 6 | Strickland test | Strickland v. Washington | 197 | 2 | 1988–2026 | 78 |
| 7 | due process clause | International Shoe Co. v. Washington | 173 | 5 | 1933–2026 | 42 |
| 8 | abuse of discretion standard | Brehm v. Eisner | 148 | 4 | 1979–2026 | 58 |
| 9 | derivative claim | Tooley v. Donaldson, Lufkin, & Jenrette, Inc. | 143 | 3 | 1957–2026 | 57 |
| 10 | bad faith exception | Johnston v. Arbitrium (Cayman Islands) Handels AG | 134 | 3 | 1988–2026 | 76 |
| 11 | unjust enrichment claim | Nemec v. Shrader | 124 | 4 | 2001–2026 | 79 |
| 12 | forum selection clause | National Industries Group v. Carlyle Investment Management L.L.C. | 122 | 4 | 1996–2026 | 76 |
| 13 | pleading standard | Central Mortgage Co. v. Morgan Stanley Mortgage Capital Holdings LLC | 115 | 3 | 1982–2026 | 67 |
| 14 | aiding and abetting claim | Malpiede v. Townson | 106 | 3 | 2000–2026 | 46 |
| 15 | fundamental principle | Paramount Communications Inc. v. QVC Network Inc. | 101 | 4 | 1930–2026 | 32 |
| 16 | Brady violation | Brady v. Maryland | 101 | 3 | 1983–2026 | 37 |
| 17 | Delaware rule | Central Mortgage Co. v. Morgan Stanley Mortgage Capital Holdings LLC | 99 | 3 | 1928–2026 | 33 |
| 18 | implied covenant claim | Nemec v. Shrader | 97 | 3 | 2006–2026 | 65 |
| 19 | laches doctrine | Harold Kraft v. Wisdomtree Investments, Inc. | 95 | 3 | 1938–2026 | 54 |
| 20 | direct claim | Tooley v. Donaldson, Lufkin, & Jenrette, Inc. | 93 | 3 | 1959–2026 | 36 |
| 21 | breach of fiduciary duty claim | Nemec v. Shrader | 92 | 3 | 1996–2026 | 45 |
| 22 | VOP hearing | Kurzmann v. State | 84 | 2 | 2000–2026 | 28 |
| 23 | demand requirement | Aronson v. Lewis | 83 | 3 | 1982–2026 | 30 |
| 24 | disclosure claim | Loudon v. Archer-Daniels-Midland Co. | 82 | 3 | 1980–2026 | 35 |
| 25 | Miranda warning | Miranda v. Arizona | 79 | 4 | 1975–2025 | 15 |
| 26 | choice-of-law analysis | Deuley v. DynCorp International, Inc. | 78 | 4 | 1987–2026 | 35 |
| 27 | forum non conveniens doctrine | Martinez v. E.i. Dupont De Nemours & Co. | 77 | 4 | 1961–2026 | 25 |
| 28 | attorney-client privilege | Zirn v. VLI Corp. | 76 | 4 | 1963–2026 | 19 |
| 29 | exclusionary rule | Jones v. State | 74 | 2 | 1961–2026 | 23 |
| 30 | Caremark claim | Stone v. Ritter | 69 | 2 | 2007–2026 | 32 |
| 31 | merits of the postconviction claim | Younger v. State | 69 | 1 | 2015–2026 | 41 |
| 32 | materiality standard | TSC Industries, Inc. v. Northway, Inc. | 67 | 3 | 1985–2026 | 30 |
| 33 | Sixth Amendment violation | Wright v. State | 64 | 2 | 1976–2026 | 18 |
| 34 | hearsay rule | Demby v. State | 62 | 3 | 1925–2026 | 11 |
| 35 | demand futility analysis | Aronson v. Lewis | 62 | 2 | 1984–2026 | 32 |
| 36 | non-exculpated claim | Leal v. Meeks | 61 | 2 | 2013–2026 | 32 |
| 37 | law of the case doctrine | Gannett Co., Inc. v. Kanaga | 61 | 3 | 2000–2026 | 29 |
| 38 | Daubert factors | Daubert v. Merrell Dow Pharmaceuticals, Inc. | 60 | 3 | 2000–2026 | 32 |
| 39 | default rule | Aronson v. Lewis | 60 | 3 | 1996–2026 | 32 |
| 40 | plain error is limited to material doctrine | Wainwright v. State | 59 | 2 | 1986–2026 | 20 |
| 41 | McWane doctrine | McWane Cast Iron Pipe Corp. v. McDowell-Wellman Engineering Co. | 59 | 3 | 1998–2026 | 28 |
| 42 | integration clause | Kronenberg v. Katz | 57 | 3 | 2003–2026 | 36 |
| 43 | fiduciary duty claim | Nemec v. Shrader | 57 | 2 | 1977–2026 | 29 |
| 44 | contractual standard | Allen v. El Paso Pipeline GP Company, L.L.C. | 57 | 3 | 1982–2026 | 32 |
| 45 | warrant requirement | Coolidge v. New Hampshire | 56 | 3 | 1974–2026 | 21 |
| 46 | waste claim | West Point-Pepperell, Inc. v. J.P. Stevens & Co. | 56 | 2 | 1999–2026 | 20 |
| 47 | complaint effectively negate claim | Malpiede v. Townson | 55 | 4 | 2003–2026 | 42 |
| 48 | interest in contesting claim | Rollins International, Inc. v. International Hydronics Corp. | 53 | 3 | 1952–2026 | 28 |
| 49 | particularity requirement | Wheeler v. State | 52 | 3 | 1990–2026 | 29 |
| 50 | Aronson test | Aronson v. Lewis | 51 | 2 | 1984–2026 | 9 |
| 51 | res judicata doctrine | Epstein v. Chatham Park, Inc. | 51 | 3 | 1935–2024 | 18 |
| 52 | internal affairs doctrine | McDermott Inc. v. Lewis | 51 | 2 | 1971–2026 | 12 |
| 53 | unclean hands doctrine | Nakahara v. NS 1991 American Trust | 51 | 3 | 1934–2026 | 29 |
| 54 | Cryo-Maid factors | Martinez v. E.i. Dupont De Nemours & Co. | 50 | 3 | 1991–2026 | 28 |
| 55 | double jeopardy clause | Blockburger v. United States | 49 | 3 | 1974–2026 | 10 |
| 56 | controversy claim | Rollins International, Inc. v. International Hydronics Corp. | 48 | 3 | 1952–2026 | 22 |
| 57 | parol evidence rule | Galantino v. Baffone | 48 | 3 | 1954–2026 | 14 |
| 58 | Revlon claim | Malpiede v. Townson | 48 | 2 | 1989–2026 | 18 |
| 59 | cognizable claim | Savor, Inc. v. FMR Corp. | 48 | 3 | 1997–2026 | 22 |
| 60 | Fifth Amendment privilege | Miranda v. Arizona | 46 | 3 | 1972–2025 | 4 |
| 61 | operative standard | Kahn v. M & F Worldwide Corp. | 46 | 3 | 2002–2026 | 26 |
| 62 | equal protection clause | City of Cleburne v. Cleburne Living Center, Inc. | 45 | 4 | 1937–2026 | 8 |
| 63 | Rales test | Rales v. Blasband Ex Rel. Easco Hand Tools, Inc. | 45 | 2 | 1995–2021 | 7 |
| 64 | tortious interference claim | Bhole, Inc. v. Shore Investments, Inc. | 45 | 3 | 1995–2026 | 33 |
| 65 | penalty hearing | Red Dog v. State | 44 | 2 | 1981–2021 | 1 |
| 66 | guilty plea challenge | Strickland v. Washington | 43 | 2 | 1976–2025 | 11 |
| 67 | reasonable doubt standard | Chapman v. California | 43 | 5 | 1979–2026 | 14 |
| 68 | sovereign immunity | Shellhorn & Hill, Inc. v. State | 43 | 3 | 1960–2026 | 8 |
| 69 | ineffective assistance claim | Strickland v. Washington | 41 | 2 | 2010–2026 | 31 |
| 70 | claim that a new rule | Younger v. State | 41 | 2 | 2014–2026 | 14 |
| 71 | indemnification claim | LaPoint v. AmerisourceBergen Corp. | 41 | 3 | 1978–2026 | 23 |
| 72 | collateral estoppel doctrine | M.G. Bancorporation, Inc. v. Le Beau | 40 | 4 | 1956–2026 | 17 |
| 73 | harmless error | Chapman v. California | 39 | 3 | 1973–2026 | 5 |
| 74 | section 220 inspection relief | Seinfeld v. Verizon Communications, Inc. | 39 | 3 | 1972–2026 | 17 |
| 75 | preponderance of the evidence standard | Estate of Osborn Ex Rel. Osborn v. Kemp | 38 | 4 | 1972–2026 | 14 |
| 76 | good faith exception | Jones v. State | 37 | 3 | 1952–2026 | 16 |
| 77 | per se rule | Chapman v. California | 36 | 5 | 1983–2026 | 8 |
| 78 | Terry stop | United States v. Sharpe | 36 | 3 | 1981–2026 | 14 |
| 79 | de novo standard | DiGiacobbe v. Sestak | 36 | 5 | 1969–2026 | 18 |
| 80 | DCF analysis | DFC Global Corporation v. Muirfield Value Partners, L.P. | 35 | 2 | 1999–2024 | 7 |
| 81 | defamation claim | Doe v. Cahill | 35 | 3 | 1988–2026 | 20 |
| 82 | defendant notice claim | Central Mortgage Co. v. Morgan Stanley Mortgage Capital Holdings LLC | 35 | 3 | 2014–2026 | 10 |
| 83 | Unocal analysis | Unocal Corp. v. Mesa Petroleum Co. | 34 | 2 | 1988–2026 | 8 |
| 84 | totality of the circumstances test | Illinois v. Gates | 34 | 3 | 1978–2026 | 6 |
| 85 | American rule | Montgomery Cellular Holding Co. v. Dobler | 34 | 3 | 1899–2026 | 17 |
| 86 | section 220 records | Amalgamated Bank v. Yahoo! Inc. | 34 | 2 | 2000–2026 | 14 |
| 87 | of review standard | Merrill v. Crothall-American, Inc. | 33 | 3 | 2015–2025 | 11 |
| 88 | fiduciary exception | Mills Acquisition Co. v. MacMillan, Inc. | 33 | 2 | 1958–2026 | 18 |
| 89 | promissory estoppel claim | Lord v. Souder | 32 | 3 | 1954–2026 | 12 |
| 90 | Restatement rule | Ungar v. Palestine Liberation Organization | 32 | 3 | 1945–2026 | 9 |
| 91 | Barker factors | Barker v. Wingo | 32 | 3 | 1987–2026 | 14 |
| 92 | enforce claim | Stuart Kingston, Inc. v. Robinson | 32 | 3 | 2014–2026 | 20 |
| 93 | fact-intensive inquiry | Auriga Capital Corp. v. Gatz Properties, LLC | 32 | 3 | 2016–2026 | 21 |
| 94 | Brophy claim | Kahn v. Kolberg Kravis Roberts & Co. | 31 | 2 | 2003–2026 | 17 |
| 95 | IAC claim | Strickland v. Washington | 31 | 2 | 2016–2026 | 20 |
| 96 | Fourth Amendment violation | Katz v. United States | 30 | 3 | 1968–2026 | 8 |
| 97 | minimum contacts analysis | Istituto Bancario Italiano SpA v. Hunter Engineering Co. | 30 | 3 | 1978–2026 | 13 |
| 98 | probable cause standard | Dorsey v. State | 30 | 4 | 1969–2026 | 11 |
| 99 | two part analysis | Dawson v. State | 29 | 3 | 1979–2024 | 7 |
| 100 | standing doctrine | Stuart Kingston, Inc. v. Robinson | 29 | 3 | 1993–2025 | 16 |
| 101 | personal jurisdiction defense | Burger King Corp. v. Rudzewicz | 29 | 3 | 1987–2026 | 17 |
| 102 | speedy trial violation | Barker v. Wingo | 29 | 3 | 1979–2026 | 8 |
| 103 | tolling doctrine | Reid v. Spazio | 29 | 4 | 2009–2026 | 18 |
| 104 | civil conspiracy claim | Nicolet, Inc. v. Nutt | 28 | 3 | 2006–2026 | 11 |
| 105 | declaratory judgment claim | Stroud v. Milliken Entersprises, Inc. | 28 | 3 | 2014–2026 | 20 |
| 106 | credible basis standard | Seinfeld v. Verizon Communications, Inc. | 27 | 2 | 2006–2025 | 13 |
| 107 | intermediate standard | Unocal Corp. v. Mesa Petroleum Co. | 27 | 2 | 1980–2026 | 15 |
| 108 | fair price inquiry | Reis v. Hazelett Strip-Casting Corp. | 27 | 2 | 1997–2026 | 15 |
| 109 | actionable claim | VLIW TECHNOLOGY, LLC v. Hewlett-Packard Co. | 27 | 3 | 2004–2026 | 16 |
| 110 | innocence test | Purnell v. State | 27 | 2 | 1994–2026 | 23 |
| 111 | Franks hearing | Franks v. Delaware | 26 | 3 | 2010–2026 | 14 |
| 112 | qualified immunity | Pearson v. Callahan | 26 | 3 | 1958–2024 | 5 |
| 113 | settlement hearing | Braun v. Fleming-Hall Tobacco Co. | 26 | 3 | 1959–2026 | 8 |
| 114 | expected standard | Abex Corporation v. Todd | 26 | 2 | 1971–2025 | 3 |
| 115 | fraudulent inducement claim | Abry Partners V, L.P. v. F & W Acquisition LLC | 26 | 2 | 2014–2026 | 15 |
| 116 | demanding bar | Lloyd v. State | 25 | 3 | 1991–2024 | 15 |
| 117 | confrontation clause | Chapman v. California | 25 | 3 | 1974–2026 | 8 |
| 118 | Sugarland factors | Sugarland Industries, Inc. v. Thomas | 25 | 2 | 2012–2026 | 14 |
| 119 | time of discovery rule | Layton v. Allen | 25 | 3 | 1968–2026 | 6 |
| 120 | conversion claim | Kuroda v. SPJS Holdings, L.L.C. | 25 | 3 | 1992–2025 | 14 |
| 121 | duty of loyalty claim | Leal v. Meeks | 25 | 2 | 1995–2026 | 9 |
| 122 | reasonably conceivable claim | Malpiede v. Townson | 25 | 3 | 2015–2026 | 19 |
| 123 | statute of limitations defense | Warner Communications Inc. v. Chris-Craft Industries, Inc. | 25 | 4 | 1987–2026 | 11 |
| 124 | collateral source rule | Yarrington v. Thornburg | 24 | 4 | 1964–2026 | 4 |
| 125 | corporate claim | Aronson v. Lewis | 24 | 2 | 1938–2026 | 7 |
| 126 | corporate opportunity doctrine | Broz v. Cellular Information Systems, Inc. | 24 | 2 | 1979–2026 | 8 |
| 127 | duty of care violation | Flood v. Synutra International, Inc. | 24 | 2 | 1989–2026 | 8 |
| 128 | Getz factors | Getz v. State | 24 | 2 | 1993–2026 | 10 |
| 129 | clear anti-reliance clause | Kronenberg v. Katz | 24 | 2 | 2004–2026 | 13 |
| 130 | section 262 appraisal proceeding | Cede & Co. v. Technicolor, Inc. | 24 | 3 | 1962–2026 | 10 |
| 131 | ex post facto clause | State v. Cohen | 23 | 2 | 1985–2023 | 8 |
| 132 | enhanced scrutiny standard | Paramount Communications Inc. v. QVC Network Inc. | 23 | 2 | 1993–2026 | 10 |
| 133 | legal significance doctrine | Orzeck v. Englehart | 23 | 2 | 1989–2026 | 9 |
| 134 | Tooley test | Brookfield Asset Management, Inc. v. Rosson | 23 | 2 | 2007–2026 | 13 |
| 135 | fraudulent concealment doctrine | In Re Tyson Foods, Inc. Consolidated Shareholder Litigation | 23 | 4 | 1968–2026 | 14 |
| 136 | breach standard | Dishmon v. Fucci | 23 | 3 | 2015–2026 | 13 |
| 137 | five-step test | Daubert v. Merrell Dow Pharmaceuticals, Inc. | 22 | 3 | 1993–2026 | 12 |
| 138 | unanimity instruction | Probst v. State | 22 | 3 | 1988–2025 | 4 |
| 139 | contra proferentem doctrine | Norton v. K-Sea Transportation Partners L.P. | 22 | 3 | 2016–2025 | 15 |
| 140 | core defense | Bradley v. State | 22 | 3 | 1989–2026 | 7 |
| 141 | economic loss doctrine | Danforth v. Acorn Structures, Inc. | 22 | 4 | 1992–2025 | 12 |
| 142 | directors pursue the corporate claim | Aronson v. Lewis | 22 | 1 | 2012–2025 | 12 |
| 143 | complaint that an affirmative defense | Reid v. Spazio | 22 | 3 | 2015–2026 | 14 |
| 144 | incorporation by reference doctrine | Amalgamated Bank v. Yahoo! Inc. | 22 | 3 | 2016–2025 | 11 |
| 145 | Blockburger test | Blockburger v. United States | 21 | 2 | 1980–2025 | 4 |
| 146 | claim for plain error | Wainwright v. State | 21 | 2 | 2014–2026 | 8 |
| 147 | knowing and intelligent waiver | Faretta v. California | 21 | 3 | 1977–2026 | 5 |
| 148 | ripeness requirement | Stroud v. Milliken Entersprises, Inc. | 21 | 2 | 1989–2026 | 11 |
| 149 | source doctrine | Lopez-Vazquez v. State | 21 | 3 | 1965–2026 | 13 |
| 150 | alibi instruction | Strickland v. Washington | 21 | 3 | 1979–2025 | 7 |
Top 150 by distinct citing opinions.