### **Exhibit 31.1**

 

#### **CERTIFICATIONS**

 

I, John R. Hamann, certify that:

 

1.                   I have reviewed this annual report onForm 10-K of Thomas Group, Inc.;

 

2.                   Based on my knowledge, this annualreport does not contain any untrue statement of a material fact or omit to statea material fact necessary to make the statements made, in light of thecircumstances under which such statements were made, not misleading withrespect to the period covered by this annual report;

 

3.                   Based on my knowledge, the financialstatements, and other financial information included in this annual report,fairly present in all material respects the financial condition, results ofoperations and cash flows of the registrant as of, and for, the periodspresented in this annual report;

 

4.                     The registrant’s other certifyingofficers and I are responsible for establishing and maintaining disclosurecontrols and procedures (as defined in Exchange Act Rules 13a-14 and 15d-14)for the registrant and we have:

 

a)                  designed such disclosure controls andprocedures to ensure that material information relating to the registrant,including its consolidated subsidiaries, is made known to us by others withinthose entities, particularly during the period in which this annual report isbeing prepared;

 

b)                   (paragraph omitted pursuant to SECRelease Nos. 33–8238 and 34-47986)

 

c)                    evaluated the effectiveness of theregistrant’s disclosure controls and procedures as of a date within 90 daysprior to the filing date of this annual report (the “Evaluation Date”); and

 

d)                   presented in this annual report ourconclusions about the effectiveness of the disclosure controls and proceduresbased on our evaluation as of the Evaluation Date;

 

5.                   The registrant’s other certifyingofficers and I have disclosed, based on our most recent evaluation, to theregistrant’s auditors and the audit committee of registrant’s board ofdirectors (or persons performing the equivalent function):

 

a)                  all significant deficiencies in thedesign or operation of internal controls which could adversely affect theregistrant’s ability to record, process, summarize and report financial dataand have identified for the registrant’s auditors any material weaknesses ininternal controls; and

 

b)                 any fraud, whether or not material,that involves management or other employees who have a significant role in theregistrant’s internal controls; and

 

6.                   The registrant’s other certifyingofficers and I have indicated in this annual report whether or not there weresignificant changes in internal controls or in other factors that couldsignificantly affect internal controls subsequent to the date of our mostrecent evaluation, including any corrective actions with regard to significantdeficiencies and material weaknesses.

 
| Date:  December 19, 2003 |                |   |
|--------------------------|---------------------|--------|
|                     | /s/ John R. Hamann  |   |
|                     | John R. Hamann      |   |
|                     | President and Chief |   |
|                     | Executive Officer   |   |

 

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