Summary. This toolkit collects working templates for every document in a federal amendment dispute, built around a running patent example. It includes a meet-and-confer letter requesting consent, a stipulation and proposed order to amend and modify the schedule, a notice of motion and memorandum outline for leave to amend, a redline exhibit protocol, a Rule 16(b)(4) good-cause declaration with a diligence chronology, a relation-back analysis worksheet, a futility opposition outline, a prejudice declaration, and a proposed order granting leave on conditions. Each template states its purpose, owner, and timing, uses bracketed placeholders, and is followed by drafting commentary tied to the governing rules and cases. The running example follows a sensor company that learns of a new accused product after the amendment deadline, and an accused infringer that wants to add inequitable conduct. Practitioners should adapt each template to local rules and the assigned judge's practices.

How to use this toolkit

The templates follow the order in which an amendment dispute unfolds: ask for consent, document the agreement or make the motion, support it with a diligence record and a redline, test relation back, and, on the other side, oppose with prejudice and futility showings. Each template has three parts: a header stating Purpose / Owner / When to use, the template itself with [BRACKETED PLACEHOLDERS], and drafting commentary tied to authority.

The doctrine behind the templates is in Amending Pleadings Under Rule 15: Leave to Amend, Relation Back, and the Scheduling Order Trap. The step-by-step procedure is in Moving for or Opposing Leave to Amend a Pleading: A Practical Guide, and the item-by-item task list is the Amended Pleading and Relation Back Checklist: A Practical Checklist.

These are starting points. Every district has local rules on motion format, page limits, meet-and-confer certifications, and proposed pleadings, and many judges have individual practices that add more. Conform each template before use.

Template index

No. Template Owner When to use
1 Meet-and-confer letter requesting consent Movant Before any motion for leave
2 Stipulation and proposed order to amend and modify schedule Both When the opponent consents, especially after the deadline
3 Notice of motion and memorandum outline for leave to amend Movant When consent is refused
4 Redline exhibit protocol Movant With every proposed amended pleading
5 Rule 16(b)(4) good-cause declaration and diligence chronology Movant When the scheduling order deadline has passed
6 Relation-back analysis worksheet Both When any new claim or party would be time-barred
7 Futility opposition outline Opponent When the proposed amendment has a clear legal defect
8 Prejudice declaration Opponent With any opposition that argues prejudice
9 Proposed order granting leave on conditions Both With the motion or opposition, to frame the ruling
10 Motion for leave to file a supplemental pleading (insert) Movant For events after the original pleading

Running example: Calloway Sensors v. Tessaline Corp.

Calloway Sensors, Inc. sues Tessaline Corp. in federal court, alleging that Tessaline's T-200 pressure sensor infringes Calloway's U.S. Patent No. [X,XXX,111] (the '111 patent) under 35 U.S.C. § 271. The scheduling order sets [June 1] as the deadline to amend pleadings. Three things happen after that date:

  1. August 14: In source code review under the protective order, Calloway's expert finds that Tessaline's newer T-400 sensor uses the same calibration routine as the T-200. Tessaline's interrogatory answers had described the T-400 as a "different architecture."
  2. August 29: Calloway's continuation application issues as U.S. Patent No. [X,XXX,222] (the '222 patent), with claims directed to the calibration routine.
  3. September 5: At the deposition of Calloway's prosecution counsel, Tessaline learns that a prior-art reference cited in a parallel European prosecution was not disclosed to the USPTO. Tessaline wants to add an inequitable conduct defense and counterclaim.

Calloway wants to (a) add the T-400 as an accused product, (b) supplement to add the '222 patent, and (c) plead willfulness based on Tessaline's knowledge of the '111 patent from Calloway's pre-suit notice letter. Tessaline wants to oppose (a) and (b) and to amend its own answer for inequitable conduct. The templates below use this example.

Template 1: Meet-and-confer letter requesting consent

Purpose: Request written consent to amend under Rule 15(a)(2), propose terms that minimize prejudice, and create a record of good-faith conferral. Owner: Movant's counsel. When to use: As soon as the proposed pleading and redline are ready, and before filing any motion. Required by many local rules for nondispositive motions.

[DATE]

VIA EMAIL

[OPPOSING COUNSEL NAME]
[FIRM]
[ADDRESS]

Re: [CASE CAPTION], No. [CASE NUMBER] ([COURT]):
    Request for Consent to File [First] Amended Complaint

Dear [NAME]:

We write to request [DEFENDANT]'s written consent under Fed. R. Civ. P.
15(a)(2) to the filing of the enclosed proposed [First] Amended Complaint,
and to a corresponding modification of the Scheduling Order [ECF No. __].

1. What the amendment does. The proposed pleading:
   (a) [adds the T-400 sensor as an accused product under the '111 patent];
   (b) [adds allegations of willful infringement based on the [DATE]
       notice letter]; and
   (c) [describes any other change].
   It makes no other substantive change. A redline against the operative
   complaint is enclosed as Attachment B.

2. Why now. [The facts supporting paragraph (a) were first identified on
   [DATE] during source code review that began on [DATE], after
   [DEFENDANT]'s production of the T-400 source code on [DATE].]
   We are raising this within [__] days of learning the facts.

3. Proposed terms. To avoid any prejudice, we propose:
   (a) a [__]-day extension of fact discovery limited to the [T-400];
   (b) [DEFENDANT]'s response to the amended complaint due [__] days
       after filing;
   (c) [any other term, e.g., supplementation of contentions by DATE].

4. Request. Please let us know by [DATE, allowing at least 3-5 business
   days] whether [DEFENDANT] consents, consents in part, or opposes. If
   [DEFENDANT] consents, we will circulate a stipulation and proposed
   order. If not, we are available to confer by phone on [DATES] and
   will otherwise file a motion for leave on or after [DATE], noting
   [DEFENDANT]'s position.

Sincerely,

[NAME]
Counsel for [PLAINTIFF]

Enclosures: Proposed [First] Amended Complaint (Attachment A);
            Redline (Attachment B)

Drafting commentary.

  • Consent must be in writing to satisfy Fed. R. Civ. P. 15(a)(2). An email reply agreeing to the terms is written consent, but a filed stipulation is safer.
  • If the scheduling order deadline has passed, consent alone does not authorize the amendment; the schedule can be modified only "for good cause and with the judge's consent" under Rule 16(b)(4). The letter therefore asks for agreement to a modified schedule, which the parties will submit to the court as Template 2.
  • Paragraph 2 previews the diligence showing. Write it accurately; the opponent will quote it back if it overstates the timeline.
  • Offering a limited extension in paragraph 3 helps on the Foman prejudice factor even if consent is refused. Foman v. Davis, 371 U.S. 178 (1962).

Template 2: Stipulation and proposed order to amend and modify schedule

Purpose: Record the opponent's consent and obtain the court's approval of both the amendment and any schedule change. Owner: Both parties (usually drafted by the movant). When to use: When the opponent consents, in whole or in part.

[COURT CAPTION]

STIPULATION AND [PROPOSED] ORDER GRANTING LEAVE TO FILE
[FIRST] AMENDED [COMPLAINT/ANSWER] AND MODIFYING SCHEDULING ORDER

Plaintiff [NAME] and Defendant [NAME], through counsel, stipulate as
follows:

1. Under Fed. R. Civ. P. 15(a)(2), [DEFENDANT] consents to the filing
   of the [First] Amended [Complaint] attached as Exhibit A.

2. The parties agree, and respectfully submit, that good cause exists
   under Fed. R. Civ. P. 16(b)(4) to modify the Scheduling Order [ECF
   No. __] because [one or two sentences: e.g., the facts supporting the
   amendment were first disclosed in discovery produced on DATE, after
   the [DATE] deadline to amend].

3. [PLAINTIFF] shall file the [First] Amended [Complaint] within [3]
   days after entry of this Order. [DEFENDANT] shall answer or otherwise
   respond within [__] days after filing.

4. The Scheduling Order is modified as follows:

   | Event                       | Current date | New date |
   |-----------------------------|--------------|----------|
   | [Close of fact discovery     | [DATE]       | [DATE]   |
   |  (limited to new matter)]    |              |          |
   | [Supplemental contentions]   | [N/A]        | [DATE]   |
   | [Other]                      | [DATE]       | [DATE]   |

   All other dates remain unchanged.

5. [Optional: Claims [__] are dismissed [with/without] prejudice.]
   [Optional: Each party reserves all defenses, including limitations
   and failure to state a claim, as to the amended pleading.]

Dated: [DATE]

[SIGNATURE BLOCKS]

[PROPOSED] ORDER

Pursuant to the foregoing stipulation, and good cause appearing, IT IS
SO ORDERED.

Dated: ______________            ______________________________
                                 United States District Judge

Drafting commentary.

  • Paragraph 2 gives the court the good-cause basis it needs under Rule 16(b)(4). Courts are reluctant to change a schedule on a bare stipulation; one or two sentences of explanation help.
  • Paragraph 5's reservation lets the opponent consent without waiving limitations or Rule 12(b)(6) arguments. Opponents should insist on it.
  • If claims are being dropped, say whether the dismissal is with or without prejudice. Some circuits hold that Rule 41(a) applies only to entire actions, so dropping individual claims by amendment is the cleaner vehicle, Taylor v. Brown, 787 F.3d 851 (7th Cir. 2015).
  • If the case was removed and the amendment drops federal claims, the court will lose supplemental jurisdiction and remand, Royal Canin U.S.A., Inc. v. Wullschleger, 604 U.S. 22 (2025). A defendant consenting to such an amendment is effectively consenting to remand.

Template 3: Notice of motion and memorandum outline for leave to amend

Purpose: Move for leave when consent is refused, addressing every standard the court must apply. Owner: Movant's counsel. When to use: After conferral fails. File with Templates 4, 5, and 9.

[COURT CAPTION]

[PLAINTIFF]'S MOTION FOR LEAVE TO FILE [FIRST] AMENDED COMPLAINT
[AND TO MODIFY THE SCHEDULING ORDER]

[PLAINTIFF] moves under Fed. R. Civ. P. 15(a)(2) and 16(b)(4) for leave
to file the [First] Amended Complaint attached as Exhibit A and for a
limited modification of the Scheduling Order. A redline comparing the
proposed pleading to the operative complaint is Exhibit B. The grounds
are set out in the accompanying memorandum and the Declaration of
[NAME] (Exhibit C). [Counsel conferred with counsel for [DEFENDANT] on
[DATE]; [DEFENDANT] opposes.] [LOCAL RULE CERTIFICATION.]

MEMORANDUM OUTLINE

I.   INTRODUCTION (one paragraph)
     - What the amendment adds; why it could not be added earlier;
       what limited schedule change is requested.

II.  BACKGROUND
     A. Procedural history and the [DATE] amendment deadline.
     B. Chronology of the new facts (cite Decl. ¶¶ __; Exs. __).
     C. Conferral and [DEFENDANT]'s position.

III. GOOD CAUSE EXISTS UNDER RULE 16(b)(4)
     A. Standard: diligence is the primary consideration [cite circuit
        authority].
     B. [PLAINTIFF] could not have met the deadline despite diligence:
        1. The facts were in [DEFENDANT]'s exclusive possession.
        2. [PLAINTIFF] pursued them promptly (requests served [DATE];
           follow-up [DATE]; production [DATE]).
        3. [PLAINTIFF] moved within [__] days of learning them.
     C. [If circuit uses factor test: importance of amendment; minimal
        prejudice; availability of a short extension.]

IV.  LEAVE SHOULD BE FREELY GIVEN UNDER RULE 15(a)(2)
     A. Standard: Foman factors; prejudice is the key consideration.
     B. No undue delay.
     C. No bad faith or dilatory motive.
     D. No repeated failure to cure (first amendment / prior amendments).
     E. No undue prejudice: discovery status; limited additional
        discovery; proposed schedule.
     F. The amendment is not futile (Part V).

V.   THE AMENDMENT IS NOT FUTILE
     - Each new claim states a plausible claim under Twombly/Iqbal
       [and Rule 9(b) if applicable]; address the opponent's
       anticipated arguments briefly.

VI.  [IF NEEDED] THE NEW CLAIMS RELATE BACK UNDER RULE 15(c)
     - Identify the route and each element (see Template 6).

VII. [IF NEEDED] JURISDICTION
     - Diversity, supplemental jurisdiction, or 28 U.S.C. § 1447(e).

VIII. CONCLUSION AND PROPOSED SCHEDULE
     - Table of current and proposed dates.

Drafting commentary.

Template 4: Redline exhibit protocol

Purpose: Produce an accurate, readable comparison of the proposed amended pleading against the operative pleading. Owner: Movant (paralegal or associate, with attorney review). When to use: With every proposed amended pleading, whether or not the local rule requires it.

REDLINE EXHIBIT PROTOCOL: [CASE NAME]

1. Base document. Use the operative pleading AS FILED: download from
   the docket [ECF No. __] and convert to text. Do not use a draft or
   a word-processing file that may differ from the filed version.

2. Comparison document. Use the final proposed amended pleading,
   identical to Exhibit A, including caption, signature block, and
   exhibits list.

3. Comparison settings.
   - Deletions: strikethrough. Additions: underline (and, if permitted,
     a second color).
   - Compare at word level, not character level.
   - Treat moved text as deletion + addition unless the software
     reliably marks moves.
   - Turn off formatting-change marks unless formatting is substantive.

4. Paragraph numbering. If paragraphs are renumbered, add a short
   cover table:

   | Original ¶ | Amended ¶ | Change |
   |------------|-----------|--------|
   | [12]       | [12]      | [Unchanged] |
   | [N/A]      | [13-21]   | [New: T-400 allegations] |
   | [13]       | [22]      | [Renumbered only] |

5. Quality check (attorney).
   [ ] Every substantive change appears in the redline.
   [ ] No change appears in the redline that is not in Exhibit A.
   [ ] Caption, title, and signature block changes are shown.
   [ ] Exhibits to the pleading are listed; new exhibits identified.
   [ ] No tracked-changes metadata in the clean Exhibit A.
   [ ] File names: "Ex. A - Proposed [First] Amended Complaint (clean)";
       "Ex. B - Redline Against [Complaint] (ECF No. __)".

6. Legend (place at top of Exhibit B):
   "This comparison is provided for the Court's convenience. Deletions
   from [ECF No. __] are shown in strikethrough; additions are
   underlined. Exhibit A is the operative proposed pleading."

Drafting commentary.

  • Some local rules require a version of the proposed pleading showing changes by bracketing or striking deletions and underlining additions; the District of New Jersey's Local Civil Rule 15.1 and the Western District of Washington's LCR 15 are examples. Read the current text of the applicable local rule before filing; local rules are adopted under Rule 83 and change.
  • The cover table in step 4 is the single most useful aid when renumbering is unavoidable.
  • The clean pleading must be complete in itself; many districts prohibit incorporating the prior pleading by reference despite Rule 10(c). An amended pleading supersedes the original, so anything left out is presumptively abandoned, Young v. City of Mount Ranier, 238 F.3d 567 (4th Cir. 2001).

Template 5: Rule 16(b)(4) good-cause declaration and diligence chronology

Purpose: Provide admissible evidence of diligence for a post-deadline motion. Owner: Movant's counsel (declarant is usually the attorney with personal knowledge of discovery; sometimes an expert or client representative). When to use: Whenever the scheduling order deadline to amend or join parties has passed.

[COURT CAPTION]

DECLARATION OF [NAME] IN SUPPORT OF [PLAINTIFF]'S MOTION FOR
LEAVE TO FILE [FIRST] AMENDED COMPLAINT

I, [NAME], declare:

1. I am [a partner at FIRM], counsel for [PLAINTIFF]. I have personal
   knowledge of the facts stated here [or: based on my review of the
   firm's files and the discovery record].

2. The Scheduling Order [ECF No. __], entered [DATE], set [DATE] as the
   deadline to amend pleadings.

3. Chronology. The following events are reflected in the documents
   attached as Exhibits [__]:

| Date    | Event                                      | Source          |
|---------|--------------------------------------------|-----------------|
| [DATE]  | [PLAINTIFF] serves RFP No. [__] seeking     | Ex. [1]         |
|         | source code for all pressure sensors        |                 |
| [DATE]  | [DEFENDANT] objects; produces T-200 code    | Ex. [2]         |
|         | only; interrogatory answer describes T-400  |                 |
|         | as "different architecture"                 |                 |
| [DATE]  | Meet-and-confer letter re T-400 code        | Ex. [3]         |
| [DATE]  | Amendment deadline passes                   | ECF No. [__]    |
| [DATE]  | [DEFENDANT] produces T-400 code             | Ex. [4]         |
| [DATE]  | Expert review begins                        | Ex. [5]         |
| [DATE]  | Expert identifies shared calibration        | Ex. [5] ¶ [__]  |
|         | routine                                     |                 |
| [DATE]  | Proposed amended complaint sent to opposing | Ex. [6]         |
|         | counsel; consent requested                  |                 |
| [DATE]  | Consent refused                             | Ex. [7]         |
| [DATE]  | This motion filed                           | n/a             |

4. Before [DATE], [PLAINTIFF] did not have [the T-400 source code /
   the information in Exhibit __]. [Explain why public information was
   insufficient, e.g., the T-400 product literature does not describe
   the calibration routine.]

5. [Explain any interval longer than a few weeks between events.]

6. The amendment will require the following additional discovery:
   [list, e.g., one supplemental deposition of DEFENDANT's engineer
   limited to the T-400; supplemental expert report]. [PLAINTIFF]
   proposes that it be completed by [DATE], which does not affect the
   [trial/dispositive motion] date.

I declare under penalty of perjury under the laws of the United States
of America that the foregoing is true and correct.

Executed on [DATE] at [CITY, STATE].

______________________
[NAME]

Drafting commentary.

  • The declaration is made under 28 U.S.C. § 1746 (the closing formula above). Attach the documents; do not merely describe them.
  • The chronology must answer the question courts ask under Johnson: could the deadline "reasonably be met despite the diligence of the party seeking the extension"? Paragraph 4 is where most declarations fail, because the opponent will argue the facts were available earlier. In Johnson, the defendant's answer and discovery responses had disclosed the correct party; in Parker v. Columbia Pictures Industries, 204 F.3d 326 (2d Cir. 2000), the movant had the information before the deadline. Address that argument directly.
  • Paragraph 5 matters. Explain every gap, even short ones. Courts in the Seventh Circuit and elsewhere treat diligence as the primary consideration, Alioto v. Town of Lisbon, 651 F.3d 715 (7th Cir. 2011).
  • In patent cases, a parallel declaration usually supports a motion to amend contentions under the local patent rules, whose diligence requirement the Federal Circuit has upheld, O2 Micro International Ltd. v. Monolithic Power Systems, Inc., 467 F.3d 1355 (Fed. Cir. 2006). Use one chronology for both.
  • Defendants moving to amend an answer after the deadline need the same declaration. Sherman v. Winco Fireworks, Inc., 532 F.3d 709 (8th Cir. 2008) (Rule 16(b) good cause governs late amendment to add a defense). Running example: Tessaline's declaration for its inequitable conduct amendment will chronicle the September 5 deposition and the date it obtained the European file history.

Template 6: Relation-back analysis worksheet

Purpose: Test whether each new claim or party relates back to the original filing date, and identify the evidence needed. Owner: Both sides (movant to support the motion; opponent to frame the limitations defense). When to use: For every new claim or party that would be time-barred if filed on the date of the amendment.

RELATION-BACK WORKSHEET: [CASE NAME]

A. Dates
   Original pleading filed:                  [DATE]
   Limitations period expired:               [DATE] (source: [STATUTE])
   Rule 4(m) period ended:                   [DATE] (90 days + extensions)
   Proposed amendment filed/lodged:          [DATE]

B. New claim or party:  [DESCRIBE]

C. Route 1: State law, Rule 15(c)(1)(A)
   Law providing the limitations period:     [FEDERAL / STATE: ___]
   Does that law allow relation back here?   [YES / NO / UNCLEAR]
   Elements (e.g., Doe statute: diligence before expiry; particular
   description; genuine ignorance):          [LIST, with evidence]

D. Route 2: Same conduct, transaction, or occurrence, Rule 15(c)(1)(B)
   Original pleading paragraphs describing
   the same facts:                           [¶¶ __]
   New facts (if any) and whether they
   "differ in both time and type":           [ANALYSIS]
   New legal theory on same facts?           [YES / NO]
   Conclusion:                               [RELATES / DOES NOT / CLOSE]

E. Route 3: Changing the party, Rule 15(c)(1)(C)  [new parties only]
   1. Route 2 satisfied?                     [YES / NO]
   2. Notice within 4(m) period:
      Actual notice evidence:                [DOCS, DATES]
      Shared counsel:                        [YES/NO; DATES]
      Identity of interest:                  [RELATIONSHIP]
   3. No prejudice in defending on merits:   [ANALYSIS]
   4. Knew or should have known action
      would have been brought against it:    [ANALYSIS]
   5. Mistake concerning identity:
      - Misnomer / wrong affiliate?          [YES / NO]
      - Deliberate choice with full
        understanding?                       [YES / NO]
      - John Doe placeholder?                [YES / NO; circuit rule: __]
   Conclusion:                               [RELATES / DOES NOT / CLOSE]

F. Fallbacks
   Equitable tolling facts:                  [LIST]
   Protective new action needed?             [YES / NO; file by DATE]

G. Bottom line and risk:                     [ONE PARAGRAPH]

Drafting commentary.

Template 7: Futility opposition outline

Purpose: Oppose leave on the ground that the proposed amendment would not survive a motion to dismiss. Owner: Opponent's counsel. When to use: When a proposed claim has a clear defect on the face of the pleading. Combine with delay and prejudice arguments; do not rely on futility alone unless the defect is plain.

[DEFENDANT]'S OPPOSITION TO MOTION FOR LEAVE TO AMEND: OUTLINE

I.   INTRODUCTION
     - Leave should be denied because [the deadline passed and PLAINTIFF
       was not diligent] and [the new claim is futile].

II.  [IF APPLICABLE] NO GOOD CAUSE UNDER RULE 16(b)(4)
     - Timeline showing PLAINTIFF had the facts by [DATE] (Template 8
       exhibits).

III. THE PROPOSED AMENDMENT IS FUTILE
     A. Standard: a proposed amendment is futile if it would not
        withstand a Rule 12(b)(6) motion.
     B. Claim-by-claim defects (use only those that apply):
        1. Time bar without relation back
           - New facts differ in time and type (Mayle).
           - New party: no notice within Rule 4(m) period; no mistake;
             John Doe substitution (circuit authority).
        2. Lack of particularity (Rule 9(b))
           - Missing who/what/when/where/how; for inequitable conduct,
             Exergen elements (specific individual; specific reference;
             materiality; facts supporting inference of intent).
        3. Implausibility (Twombly/Iqbal)
           - Conclusory allegations of [knowledge / agreement / intent].
        4. Legal bar
           - [Preemption / economic loss rule / contractual limitation /
             no private right of action / immunity].
        5. Repetition of allegations already held insufficient
           - [Compare ¶¶ __ to the Court's Order, ECF No. __].
     C. The defects cannot be cured; [PLAINTIFF] has identified no
        additional facts.

IV.  UNDUE PREJUDICE AND DELAY (Template 8)

V.   ALTERNATIVELY, CONDITIONS (Template 9)

VI.  CONCLUSION

Drafting commentary.

Template 8: Prejudice declaration

Purpose: Provide specific, admissible evidence of the prejudice the amendment would cause. Owner: Opponent's counsel (declarant: litigation counsel; sometimes an expert or client representative). When to use: With any opposition arguing prejudice or lack of diligence.

DECLARATION OF [NAME] IN SUPPORT OF [DEFENDANT]'S OPPOSITION TO
MOTION FOR LEAVE TO AMEND

1. I am [counsel for DEFENDANT] and have personal knowledge of the
   matters stated.

2. Status of the case. Fact discovery [closed / closes] on [DATE].
   [__] depositions have been taken, including [list key witnesses].
   Opening expert reports [were served / are due] on [DATE].
   [Summary judgment / claim construction / trial] is set for [DATE].

3. When [PLAINTIFF] had the facts. [PLAINTIFF] possessed or was told
   the facts underlying the proposed amendment no later than [DATE]:
   (a) [Answer ¶ __ (ECF No. __) stated ___]  (Ex. [1])
   (b) [Initial disclosures served DATE identified ___]  (Ex. [2])
   (c) [Document PLTF_000123, produced by PLAINTIFF, states ___] (Ex. [3])
   (d) [Deposition of ___, DATE, at __:__-__]  (Ex. [4])

4. Additional work the amendment would require:
   | Task                                   | Witnesses / scope       |
   |----------------------------------------|-------------------------|
   | [Re-depose ___ on new claim]            | [__ hours on record]    |
   | [New document collection: ___]          | [custodians; date range]|
   | [Supplemental expert report(s)]         | [expert; subject]       |
   | [New claim construction terms]          | [__ terms]              |
   | [Rebriefing of ___ motion]              | [ECF No. __]            |

5. Effect on schedule. [The work in ¶ 4 cannot be completed before
   DATE without moving the ___ date.] [Explain why a short extension
   would not cure it, if that is the case.]

6. [Optional: Evidence lost or witnesses unavailable since DATE.]

I declare under penalty of perjury that the foregoing is true and
correct. Executed on [DATE] at [CITY, STATE].
______________________
[NAME]

Drafting commentary.

  • Prejudice is the factor courts weigh most heavily under Rule 15(a)(2). The Supreme Court in Zenith Radio Corp. v. Hazeltine Research, Inc., 401 U.S. 321 (1971) upheld refusal of a late amendment where the opponent had proved its damages at trial on a theory the new defenses would undercut. That level of specificity is the target.
  • Paragraph 3 supports both the Rule 16(b)(4) argument and the "undue delay" factor. The Tenth Circuit, for example, focuses primarily on the reasons for delay and allows denial where the movant has no adequate explanation, Minter v. Prime Equipment Co., 451 F.3d 1196 (10th Cir. 2006).
  • Paragraph 5 anticipates the Fifth Circuit's fourth factor, whether a continuance would cure the prejudice, under S&W. If a short extension would cure it, say what it would cost; do not pretend it would not.
  • Do not claim prejudice from the merits of the new claim. "We would have to defend against an additional claim" is not prejudice in the Rule 15 sense.

Template 9: Proposed order granting leave on conditions

Purpose: Frame the ruling for the court and capture any conditions. Owner: Either side; movants submit an unconditional version, opponents a conditional alternative. When to use: With the motion or the opposition.

[COURT CAPTION]

[PROPOSED] ORDER ON MOTION FOR LEAVE TO FILE [FIRST] AMENDED
[COMPLAINT/ANSWER]

Upon consideration of [MOVANT]'s Motion for Leave [ECF No. __], the
opposition, and the reply, the Court finds that [MOVANT] has shown good
cause under Fed. R. Civ. P. 16(b)(4) to modify the Scheduling Order and
that leave to amend is warranted under Fed. R. Civ. P. 15(a)(2).

IT IS ORDERED:

1. The Motion is GRANTED [in part]. [MOVANT] shall file the [First]
   Amended [Complaint] in the form attached to the Motion as Exhibit A
   [except paragraphs __, which are stricken] within [3] days.

2. [Respondent] shall answer or otherwise respond within [14] days after
   filing. [Any newly added party shall respond as provided in Rule 12(a)
   after service of a summons.]

3. [Conditions, if any:]
   (a) Additional fact discovery is permitted through [DATE], limited to
       [the new matter].
   (b) [MOVANT] shall serve [supplemental contentions / an
       identification of ___] by [DATE].
   (c) [MOVANT] shall bear the reasonable costs of [a second deposition
       of ___ limited to the new matter].
   (d) [Claims __ are dismissed with prejudice.]

4. The Scheduling Order is modified as follows: [TABLE]. All other dates
   remain in effect.

5. [The pending Motion to Dismiss, ECF No. __, is DENIED AS MOOT without
   prejudice to renewal against the amended pleading.]

Dated: ______________          ______________________________
                               United States District Judge

Drafting commentary.

Template 10: Motion for leave to file a supplemental pleading (insert)

Purpose: Add events that occurred after the original pleading. Owner: Movant's counsel. When to use: For new patents, continuing conduct, post-filing knowledge, or other post-pleading events. Use as an insert in Template 3.

[INSERT FOR TEMPLATE 3, NEW PART]

LEAVE TO SUPPLEMENT SHOULD BE GRANTED UNDER RULE 15(d)

A. Rule 15(d) permits supplementation with "any transaction,
   occurrence, or event that happened after the date of the pleading
   to be supplemented."

B. The new matter occurred after [DATE of operative pleading]:
   - [The '222 patent issued on DATE, after the complaint was filed.]
   - [Defendant received notice of the '111 patent through ___ on DATE.]

C. The new matter is closely related to the existing claims:
   - [Same accused products; same calibration routine; same
     specification; overlapping witnesses and documents.]
   - Litigating it here avoids a second action and duplicative
     discovery.

D. No undue delay or prejudice: [moved within __ days of issuance];
   [limited additional discovery: ___].

E. Proposed supplemental pleading: Exhibit [__]. [State whether it is
   filed as a separate supplemental pleading or combined with the
   amended complaint, per local practice.]

Drafting commentary.

  • The Supreme Court endorsed supplementation for related later events in Griffin v. County School Board of Prince Edward County, 377 U.S. 218 (1964), and Rule 15(d) expressly allows it "even though the original pleading is defective in stating a claim or defense"; see also Mathews v. Diaz, 426 U.S. 67 (1976).
  • Courts often allow a single "amended and supplemental complaint." Label it accurately; the label matters for relation back, because supplemental matter by definition did not exist at the original filing.
  • Running example: Calloway combines Templates 3 and 10 in one motion, attaching a proposed "First Amended and Supplemental Complaint" that adds the T-400 (amendment) and the '222 patent and post-filing willfulness facts (supplement), with one declaration under Template 5 and one redline under Template 4.

How the running example resolves

The court grants Calloway's motion to add the T-400, finding good cause because the T-400 source code was produced after the deadline and Calloway moved within three weeks of its expert's finding. It grants leave to supplement with the '222 patent, conditioned on Calloway serving infringement contentions for the new patent within 30 days and the parties submitting a joint proposal for any additional claim construction. It grants leave to plead willfulness as to the '111 patent but leaves Tessaline's product-specific knowledge argument for a later motion. On Tessaline's motion, the court finds good cause for the timing (the deposition occurred after the deadline) but denies the inequitable conduct amendment without prejudice as futile under Exergen, granting leave to file a revised proposed pleading within 21 days that identifies the individual, the reference, the claims, and the facts supporting intent.

The pattern is typical: diligence decided the timing questions, conditions managed the prejudice, and futility was resolved on the face of the proposed pleading, with a chance to cure.

Common drafting errors across templates

  • Using a different version of the proposed pleading in the motion, the redline, and the conferral letter.
  • Declarations that describe documents without attaching them.
  • Chronologies with unexplained gaps.
  • Stipulations that change dates without a proposed order.
  • Futility oppositions that argue facts outside the proposed pleading.
  • Proposed orders that do not address pending motions directed at the superseded pleading.
  • Forgetting the new party's summons.

For the answer side of an amendment dispute, including amended affirmative defenses, see the Responsive Pleading Toolkit: Answer Templates, Affirmative Defense Libraries, and Counterclaim Outlines. For broader motion forms, see the Motion Practice Toolkit: Dispositive, Discovery, and In Limine Motions. If an added defendant fails to respond to the amended pleading, the forms in the Default Judgment Toolkit: Entry Requests, Damages Declarations, and Motions to Vacate apply.

This document is general information, not legal advice for any particular situation; the law changes, local rules and judges' practices vary, and the facts matter.

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