Document:

EXHIBIT 10.15

                                    AMENDMENT

         This Amendment dated this 1st day of April, 2004 by and among COATES
INTERNATIONAL, LTD., having a business address at Highway 34 and Ridgewood Road,
Wall Township, New Jersey 07719-0738, and GEORGE COATES, having an address at
Highway 34 and Ridgewood Road, Wall Township, New Jersey 07719-9738 (the above
identified parties are collectively referred to as the "Licensor") and MCLEAN,
ENGLAND AND ASSOCIATES, LLC, having its principal offices located at One Innwood
Circle, Suite 2004, Little Rock, Arkansas 72211 (the "Licensee").

         WHEREAS, Licensor and Licensee entered into a License Agreement
originally on April 12, 2002 and have operated pursuant to their agreement
through the date of this Amendment ("License Agreement");

         WHEREAS, Licensor has retrofitted the No.1 Diesel 855 engine
incorporating the Coates CSRV System, which engine is operational on a test
stand. This engine is not ready for final testing and many costly modifications
are to be carried out before it is ready for final testing.

         WHEREAS, Licensee has requested Licensor to retrofit another 855 No. 2
engine to gasoline incorporating the CSRV by doing so has placed an extra
expense and burden on Licensor. Currently, it is not financially feasible for
Licensor to complete both engines concurrently without considerable additional
funding and staff.

         WHEREAS, in the interest of time and efficiency Licensor and Licensee
have agreed to allow Licensee at its own expense to undertake various
modifications and refinements to the No. 1 855 Diesel powered CSRV truck engine;

         WHEREAS, in order to accomplish the aforesaid mutual objective of
Licensor and Licensee, it is necessary to supplement the License Agreement
solely as specified in, and limited by, this Amendment. The permission granted
by Licensor pursuant to this Amendment is not intend to, and does not constitute
a novation of the License Agreement.

         NOW, THEREFORE, in consideration of the premises and covenants, and
other good and valuable consideration, and the mutual promises of the
performance of the undertaking set forth in the License Agreement and in this
Amendment, it is agreed, by and among Licensor and Licensee, as follows:

         1.   DEFINED TERMS. Except as specifically defined herein, all
              definitions of terms used herein shall be in accordance with the
              License Agreement.

         2.   POSSESSION. For the limited purpose set forth in paragraph 6
              below, Licensor shall permit Licensee to take possession of, but
              not title to, and to remove from Licensor's business premises, a
              single diesel powered internal combustion engine that Licensor has

See notes to the financial statements.                                        33

<PAGE>

              retro-fitted with the CSRV Valve System ("No. 1 Test Engine")
              together with one of the two trucks containing an 855 Cummins
              Engine owned by Licensee ("Test Truck"). Unless or until otherwise
              specified in the License Agreement, Licensor shall retain title to
              the Test Engine, with exception of the trucks which are the
              property of Licensee. The parties agree that the Test Engine is
              currently in a state of development, which Licensee will attempt
              to refine. The Test Engine is not ready for testing and
              certification, and does not constitute a delivery of such an
              engine as contemplated by the Confidential Addendum to the License
              Agreement.

         3.   TEST MATERIAL. Licensor shall provide Licensee with, but not title
              to, the Test Engine on test stand, all related drawings or other
              intellectual property, that Licensor feels would aid Licensee in
              its refinement efforts (collectively the "Test Material"). If
              Licensee requires any parts from Licensor, Licensee must pay for
              parts made by Licensor.

         4.   SHIPPING. Licensee shall be responsible for packing, crating,
              shipping and transporting the Test Material and all costs
              associated therewith. Licensee shall be responsible for all damage
              from whatever cause or source caused to the Test Material, while
              the Test Material is off of Licensor's business premises. Within
              five (5) days of taking possession of the Test Material Licensee
              shall deliver the Test Material to Ram Industries 7200 Industry
              Dr., North Little Rock, 72117 ("Ram Premises").

         5.   INSURANCE. Licensee shall insure the Test Material against all
              damage and loss for its full replacement value which is currently
              estimated to be $250,000 with Licensor named as the sole loss
              payee; Licensor calculates it has expended approximately
              $2,500,000.00 on Licensee's Diesel 855 engine. Moreover, Licensee
              shall provide Licensor with an insurance policy providing general
              comprehensive liability coverage for Licensor in relation to the
              Test Material that meets the specifications of the License
              Agreement. The insurance policy(ies) shall be delivered by
              Licensee to Licensor before the Test Material is removed from
              Licensor's business premises. Each insurance policy shall be
              issued by an insurance company that is reasonably acceptable to
              Licensor and which is authorized to do business both in the State
              of New Jersey and in the State of Arkansas.

         6.   PURPOSE. Licensor grants its permission for Licensee at its own
              expense to use third party firms in its refinement efforts, which
              will be required to protect the confidentiality of Licensor's
              patents and trade secrets; each such consultant shall be required
              to sign a confidentiality agreement. The required confidentiality
              agreement is attached hereto as Exhibit A ("Confidentiality
              Agreement"). Licensee shall be responsible to enforce the
              Confidentiality Agreement and shall indemnify the Licensor against
              any loss associated with a breach of the Confidentiality Agreement
              caused by, or related to, an act or omission of Licensee. Licensor
              will be the owner of all work and improvements made by Licensee
              and its third party contractors. Licensee's efforts are intended
              to supplement those of Licensor and to accelerate the time when
              the Test Engine can be tested at Southwest Research Institute for
              EPA certification purposes. Licensor, however, without having any
              obligation to do so, may, in its sole and absolute discretion,
              continue to work on the No. 2 gasoline engine project to
              completion.

         7.   Payment. All payments due Licensor by Licensee shall become due,
              and will be paid, in accordance with the License Agreement, except
              that if Licensee through its efforts produces an engine that

See notes to the financial statements.                                        34

              satisfies the criteria specified in the License then the
              precondition to Licensee's payment obligation shall have been
              satisfied as if the Licensor had produced an engine that satisfied
              the criteria specified in the License and payment shall be due
              from the Licensee pursuant to the terms of the License Agreement.

         8.   REPORTS. Licensee shall provide Licensor with a written progress
              report every fifteen (15) days detailing the progress that is
              being made on the Test Engine.

         9.   LOCATION. Licensee shall not remove the Test Material from the Ram
              Premises without the prior written approval of the Licensor.
              Licensor and its agents, employees, contractors and consultants,
              on two (2) business days notice, shall have the absolute right,
              but not the obligation, to enter the Ram Premises, during normal
              business hours, to inspect the Test Engine and/or the Test Truck
              and all related data, plans, results, reports and documents
              relating to the Test Engine and/or the Test Truck.

              Licensee represents to Licensor that the Ram Premises are safe and
              secure and that access to the Test Material will be limited to the
              Licensee and its consultant which access shall be governed by the
              terms of the Confidentiality Agreement.

         10.  INDEMNIFICATION. Indemnification between the parties will be in
              accordance with the License Agreement and paragraphs 4, 6 and 9
              hereof.

         11.  CONFIDENTIALITY. The confidentiality of Licensor's patents and
              trade secretes shall be maintained in accordance with the License
              Agreement and paragraphs 6 and 9 hereof.

         12.  BREACH; REMEDIES. In the event of a breach by either party of this
              Amendment the remedies of the parties shall be governed in
              accordance with the License Agreement.

         13.  NOTICES. All notices between the parties shall be made in
              accordance with License Agreement.

         14.  APPLICABLE LAW. The law applicable to this Amendment Agreement
              shall be in accordance with License Agreement.

         15.  SEVERABILITY. If any term, covenant, condition or provision of
              this Amendment, or the application thereof to any person or
              circumstance, shall, at any time or to any extent, be invalid or
              unenforceable, the remainder of this Amendment, or the application
              of such term or provision to persons or circumstances other than
              those as to which it is held invalid or unenforceable, shall not
              be affected thereby, and each term, covenant, condition and
              provision of this Amendment shall be valid and be enforced to the
              fullest extent permitted by law.

         16.  INTERPRETATION. Wherever herein the singular number is used, the
              same shall include the plural, and the masculine gender shall
              include the feminine and neuter genders, and vice versa, as the
              context shall require.

         17.  COUNTERPARTS. This Amendment may be executed in several
              counterparts, each of which shall be an original, but all of which
              shall constitute one and the same instrument.

         18.  SECTION HEADINGS. The section headings in this Amendment are
              inserted only as a matter of convenience in reference and are not
              to be given any effect whatsoever in construing any provision of
              this Amendment.

See notes to the financial statements.                                        35

<PAGE>

         19.  ASSIGNMENT. Neither this Amendment nor the License Agreement may
              be assigned by Licensee except as permitted by the License
              Agreement. .

ATTEST:                                     COATES INTERNATIONAL, LTD.

   /s/ Shirley Naidel                        BY: /s/ George J. Coates
-----------------------------------------        ------------------------------
           Shirley Naidel                        George J. Coates, President
           Notary Public - New Jersey
My Commission Expires Dec. 27, 2005
         as to Both Signatures of
            George J. Coates

    /s/ Shirley Naidel                           /s/ George J. Coates
-----------------------------------------        ------------------------------
        Shirley Naidel                           George J. Coates, Individually

ATTEST:                                     McLEAN, ENGLAND & ASSOCIATES, LLC

(Illegible)                                 By: /s/ Jeff England
-----------------------------------------        ------------------------------
                                                              Jeff England

See notes to the financial statements.                                        36termination of Employment Aggreement

 Exhibit 10.2 
  
 December 10, 2003 
  
 Kforce Inc. 
 1001 East Palm Drive 
 Tampa, FL 33605 
 Attention: William Sanders 
  

	 	Re:	Termination of Employment Agreement 

  
 Dear Bill: 
  
 The purpose of this letter is to confirm certain matters set forth in my Employment Agreement, dated January 1, 2001 (the “Employment
Agreement”), and document our arrangements following the merger of Kforce and Hall Kinion (the “Merger”) pursuant to an Agreement and Plan of Merger, dated as of December 2, 2003 (the “Merger Agreement”). At the closing of
the Merger, I will resign as an officer, director and chairman, including Chairman Emeritus of Hall Kinion and its subsidiaries. Under my agreement, I am entitled to the following benefits: (i) salary through the closing date; (ii) within three days
of the closing, a lump sum payment in the amount of $2,100,000; (iii) forgiveness of the remaining principal and interest on my note, including the release of the pledge of 433,030 shares of HK stock currently pledged as security for the loan; and
(iv) title to my Mercedes S500V automobile, without any further payments by me. My options accelerate on the closing and the in-the-money options will be converted into Kforce stock in accordance with the Merger Agreement, and all out-of-the-money
options will be automatically cancelled. At the closing of the Merger, I will execute a mutual release in the form attached to this letter as Annex A, and my Employment Agreement shall terminate and be of no further force and effect and all other
arrangements with Hall Kinion (other than those contained in this letter and my vested benefits under Hall Kinion’s 401(k) Plan and the Deferred Compensation Plan) will also terminate. 
  
 Following the closing, I will be entitled to a gross-up payment in the event
that my compensation in connection with the Merger exceeds the IRC Section 280G limits in accordance with Section 12.8 of the Employment Agreement, which will be calculated by Deloitte & Touche. I also agree to cooperate with Kforce and Hall
Kinion to minimize the negative tax effect of IRC Section 280G, including, without limitation, if necessary, by accelerating income into 2003, provided that such acceleration does not result in phantom income. 
  
 For a period of three years I will not directly or indirectly (i) solicit for
employment, or advise or recommend to any other person that they solicit for employment, any employee of Hall Kinion, and (ii) engage in any business or activity competitive with the business activities of Hall Kinion (excluding passive investments
of up to 5% of the outstanding stock of any publicly traded company, regardless of whether such company competes with Hall Kinion). I acknowledge and agree that my failure to comply with the foregoing sentence will cause irreparable injury to
Kforce, for which damages, even if available, will not be an adequate 

 
remedy. Accordingly, I consent to the issuance of injunctive relief by any court of competent jurisdiction to compel my compliance with such covenant and to
the granting by any court of the remedy of specific performance. 
  
 For so long as I am in compliance with the noncompetition and nonsolicitation covenants set forth in the preceding paragraph, (i) my spouse, my children (so long as they are minors and thereafter, to the extent such children are eligible)
and I will be entitled to participate in liability insurance, life insurance, disability insurance, dental insurance, hospitalization insurance, medical, accident, and health-related employee plans applicable to the employees of Kforce or Hall
Kinion, (ii) I will also be entitled to continue my office at 823 Grant Avenue in Novato California for the duration of the lease as well as administrative support, and (iii) I will also be entitled to an all inclusive payment of $50,000 for unused
vacation, sick leave, and outplacement service. Kforce shall have the right to change insurance carriers and benefit plans as may be appropriate in light of future market conditions and shall have the right to purchase individual policies covering
me if necessary, provided such policies provide comparable benefits. 
  
 I agree to comply with the lock-up restrictions set forth in Section 5.2(h) of the Merger Agreement. 
  
 Please sign a copy of this letter to confirm these agreements. 
  

	
	 Very truly yours,

	
	 /s/    Brenda C. Rhodes        

	

	 Brenda C. Rhodes

  

	
	 Acknowledged and agreed:
  
 Kforce Inc.

	
	 /s/ David L. Dunkel

	

	 By: David L. Dunkel
 Title: Chief Executive Officer

  
  

 2 

 ANNEX A 
  
 FORM OF MUTUAL GENERAL RELEASE 
  
 THIS MUTUAL GENERAL RELEASE (the “Release”) is effective as of             ,
2004, by and between Hall, Kinion & Associates, Inc., a Delaware corporation (“HAKI”), Kforce Inc., a Florida corporation (“Kforce”), and Brenda C. Rhodes (the “Executive”). HAKI, Kforce and the Executive
are collectively referred to in this Release as the “Parties.” 
  
 BACKGROUND 
  
 HAKI and Kforce are parties to an
Agreement and Plan of Merger, dated as of December 2, 2003, pursuant to which a wholly-owned subsidiary of Kforce will be merged with and into HAKI with HAKI surviving the merger and becoming a wholly-owned subsidiary of Kforce (the
“Merger”). Simultaneously with the closing of the Merger, the Executive’s Employment Agreement, dated January 1, 2001 (the “Employment Agreement”), has been terminated pursuant to a Letter Agreement dated as of December 10,
2003 (the “Letter Agreement”). The Parties are executing this Release pursuant to the terms of the Letter Agreement. 
  
 Accordingly, in consideration of the mutual agreements set forth below, the Parties hereby agree as follows: 
  
 TERMS 
  
 1. Mutual Release. 
  
 (a) HAKI and Kforce unconditionally and irrevocably release and forever discharge the Executive from any claims, demands, suits, debts,
contracts, agreements, promises, damages, and causes of action and judgments of any kind or nature whatsoever, known or unknown, complete or incomplete, absolute or contingent, and whether arising out of the Employment Agreement, common law, equity,
statute, or otherwise, arising under, relating to and in connection with the employer/employee relationship of HAKI and the Executive prior to the date of this Release (“Released Claims”). 
  
 (b) The Executive unconditionally and irrevocably releases
and forever discharges HAKI and Kforce from any Released Claims. The laws under which the Released Claims may arise include, but are not limited to, Title VII of the Civil Rights Act of 1964, the Age Discrimination in Employment Act, the Older
Workers’ Benefit Protection Act, the Americans with Disabilities Act, the Worker Adjustment and Retraining Notification Act, the California Fair Employment and Housing Act, the California Labor Code, the California Business and Professions
Code, California wage Orders and/or the laws prohibiting discrimination, harassment and/or retaliation in any state in which you are employed, and any and all federal, state and local employment laws, as well as any and all common law tort or
contract theories. However, the Released Claims do not include claims which by law may not be released. 
  
 (c) Notwithstanding the foregoing provisions to the contrary: 
  
 (i) The Executive does not release HAKI and Kforce from any obligations contained in this Release or for any
payments owed under the Letter Agreement; and 

 (ii) HAKI and Kforce do not release the Executive from any obligations under this Release
or the Letter Agreement or for any Released Claims involving fraud or criminal acts against HAKI and Kforce. 
  
 2. Unknown Claims. Each of the Parties acknowledges that there is a risk that subsequent to the execution of this Release, the Parties will
discover, incur or suffer Released Claims which were unknown or unanticipated at the effective time of this Release, including, without limitation, unknown or unanticipated Released Claims, which if known by it on the date this Release is being
executed may have materially affected the Parties’ decision to execute this Release. The Parties acknowledge and agree that by reason of the release contained in Section 1 of this Release, each of the Parties is assuming the risk of such
unknown and unanticipated Released Claims and agrees that its respective release contained in this Release applies to such unknown and unanticipated Released Claims. The Parties therefore waive the effect of California Civil Code section 1542 and
any other analogous provision of applicable law of any jurisdiction. Section 1542 states: 
  
 “A GENERAL RELEASE DOES NOT EXTEND TO RELEASED CLAIMS WHICH THE CREDITOR DOES NOT KNOW OR SUSPECT TO EXIST IN HIS FAVOR AT THE TIME OF EXECUTING THE RELEASE, WHICH IF KNOWN TO HIM MUST HAVE MATERIALLY AFFECTED
HIS SETTLEMENT WITH THE DEBTOR.” 
  
 3. Ownership of
Claims. Each of the Parties represents and warrants to the other that it has not previously assigned or transferred, or purported to assign or transfer, to any person or entity any Released Claim, or portion of or interest in any Released Claim,
and agrees to indemnify, defend, and hold the other harmless from and against any and all Released Claims, based on or arising out of any such assignment or transfer, or purported assignment or transfer, of any Released Claims, or any portion of or
interest in any Released Claim. 
  
 4. Notice. HAKI is
required by law to give the Executive up to 21 days in which to consider this Release. The Executive has up to and including             to sign and return this Release as set forth below.
The Executive is advised to consult an attorney regarding signing this Release. The Executive acknowledges that by signing this Release prior to the expiration of the 21 day waiting period, the Executive waives the remaining waiting period. The
Executive will have an additional seven days after signing this Release to revoke an acceptance by submitting a written statement of revocation to             [name
address]            . (“Revocation Period”) If the Executive does not timely revoke acceptance, then this Release will become final and effective upon the expiration of the
Revocation Period. If the Executive submits a signed revocation of acceptance by mail, the mailing envelope must be postmarked no later than the submission deadline. 
  
 5. Miscellaneous. 
  
 (a) Entire Agreement. This Release and the Letter Agreement constitute all of the agreements between the Parties and supersede any
prior understandings, agreements, or representations by or between the parties, written or oral, to the extent they related in any way to the subject matter of this Release or the Letter Agreement. 
  
 (b) Succession and Assignment. This Release shall be
binding upon and inure to the benefit of the Parties named in this Release and their respective successors and permitted assigns. 
  

 Annex A-2 

 (c) Counterparts. This Release may be executed in one or more counterparts, each
of which shall be deemed an original but all of which together shall constitute one and the same instrument. 
  
 (d) Governing Law. This Release shall be governed by and construed in accordance with the domestic laws of Delaware without giving
effect to any choice or conflict of law provision or rule (whether of Delaware or any other jurisdiction) that would cause the application of the laws of any jurisdiction other than Delaware. 
  
 (e) Severability. Any term or provision of this
Release that is invalid or unenforceable in any situation in any jurisdiction shall not affect the validity or enforceability of the remaining terms and provisions hereof or the validity or enforceability of the offending term or provision in any
other situation or in any other jurisdiction. 
  
 [REMAINDER OF
THIS PAGE INTENTIONALLY LEFT BLANK] 
  

 Annex A-3 

 IN WITNESS WHEREOF, the Parties have executed this Release effective as of the date first above written.

  

			
	 HALL, KINION & ASSOCIATES, Inc.,
 a
Delaware corporation

		
	By:	 	 
	 	 	

			
		
	Name:	 	 
	 	 	

			
		
	Title:	 	 
	 	 	

	 	 	 

  
  
  

			
	 KFORCE INC., a Florida corporation

		
	By:	 	 
	 	 	

			
		
	Name:	 	 
	 	 	

			
		
	Title:	 	 
	 	 	

	 	 	 

  
  
  

			
	 EXECUTIVE:

		
	By:	 	 
	 	 	

	 	 	 Brenda C. Rhodes

  

 Annex A - 4

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