Document:

Exhibit 4(ww)

I, Joseph Tung, certify that set forth below is a fair and accurate English
translation of the required document included as an exhibit to this
Registration Statement.

                                                     BY: /s/ JOSEPH TUNG
                                                         -----------------------
                                                         Title: CFO/Director
                                                         Dated: May 31, 2002

                         Plant Building Lease Agreement

                                                           Date: 31 October 2001
Parties:
     ASE (Chung-Li) Inc. ("Party A")
     ASE Material Inc. ("Party B")

Whereas, Party A desires to lease its Plant Building, at 4F, No. 550-5, Sec.1,
Chung-hwa Rd., Fu-hwa Li, Chung-Li City, Tao-Yuan County to Party B under the
following agreement.

1.   The Premises and Rent

     (1)  Premises: The Plant Building is located at 4F, No. 550-5, Sec.1,
          Chung-hwa Rd., Fu-hwa Li, Chung-Li City, Tao-Yuan County (building
          register No. 00225-005 and land register No.: 1833-0000, Fu-hsin
          Section, Chung-Li City), for the area of 4,688.41 square meters,
          inclusive of ancillary equipments (collectively; "Leased Floor").

     (2)  Rent: NT$709,122 per months, excluding business taxes.

2.   Term of Lease: one year from 1 November 2001 to 31 October 2002.

<PAGE>

3.   Usage: It is for Party B to establish its Chung-Li Plant and for the uses
     within its registered business scope. The Party B's Chung-Li Plant will be
     applied to be registered as a bonded factory.

4.   The lease shall be for the Leased Floor and existing equipment as they
     are. Party B shall be responsible for the maintenance of the Leased Floor
     and the equipment except for the building structure (including inner and
     outer walls, floor and the original water and electricity pipelines),
     which shall be Party A's responsibilities. Party B shall make good of any
     damage to the above and Party A shall bear no responsibilities thereof.

5.   Both parties agree that the rent shall be paid starting from the effective
     date of this Agreement.

6.   Party B shall be the owner of any equipment that Party B subsequently
     installs into the premises. After expiry of the lease term, Party B shall
     remove its belongings and return the Leased Floor, under the then current
     condition, to Party A. Party B, during the term of this Agreement, may not
     engage in any construction altering the structure or facilities of the
     Leased Floor unless Party A.

7.   During the term of this Agreement, the rent and fees for water and
     electricity utilities shall first be paid by Party A. Party B shall
     reimburse Party A for such payment pursuant to the consumption volume of
     electricity according to the meters separately installed for each of the
     parties. For the utilities that cannot be counted by separate meters, the
     amount of the reimbursement shall apply the same percentage that is used
     for metered utilities. As to the expenses of other utilities that should
     be jointly shared but the amount of each user cannot be decided, the
     amount of the reimbursement shall be calculated by the proportionate area
     used by such party. The land tax and building tax shall be borne by Party
     A.

8.   After the signing of this Agreement, in the event that it is necessary to
     apply with the relevant authorities (such as the municipal government or
     the

<PAGE>

     electricity company) to register the change of user, Party A shall
     promptly provide relevant materials as requested by Party B.

9.   Party A shall issue invoices to Party B for the collection of rent on a
     monthly basis and Party B shall remit the rent of the preceding month to
     the corporate account designated by Party A within ten days after receipt
     of invoice.

10.  Party A warrants that it has the legal ownership of the Leased Floor to be
     leased to Party B and Party B's leasing rights will not be affected by the
     encumbrances created by Party A or any other incidents regarding the
     Leased Floor. In case Party B's leasing rights are so affected, Party A
     shall be liable to indemnify Party B's loss resulting therefrom and pay
     additional amount equal to three times of monthly rent under this
     Agreement as compensation.

11.  Party A is the legal owner of the leased Leased Floor and shall procure
     fire insurance policy for it. Party B shall be solely responsible to
     procure fire insurance policies for its movables and equipment.

12.  Party B shall pay penalties as follows for delay payment of rent:

     (1)  5% of a monthly rent if delay is more than one month but less than
          two months;

     (2)  10% of a monthly rent if delay is more than two months but less than
          three months; and

     (3)  15% of a monthly rent if delay is more than three months and in which
     case, Party A may terminate this Agreement.

13.  Party B is entitled to a right of first refusal to lease or acquire the
     Leased Floor upon reasonable terms. Party B may not terminate this
     Agreement unless it gives Party A a three-month prior notice in writing
     and compensates Party A for an amount equal to three times of monthly rent
     under this Agreement. In the event Party A intends to early terminate this
     Agreement, the abovementioned terms and conditions shall apply.

14.  In the event Party A intends to terminate this Agreement within the ninth
     month after the lease commences, Party A shall indemnify Party B for all

<PAGE>

     construction, partitioning and fitout expenses according to their book
     values in addition to the three-month rent as stipulated above.

15.  Both parties agree that in the event Party B's bonded factory status is
     cancelled, the bonded goods shall continue staying in the warehouse of the
     Plant Building for not less than six months for customs' operations. All
     the expenses incurred thereof shall be borne by Party B.

16.  This Agreement will be executed in two counterparts and come into effect
     on the date of signing. Each of Party A and Party B will hold one copy.
     The Tao-Yuan District Court will be the court of first instance in the
     event any dispute arises in connection with this Agreement.

17.  In the event that Party B (Party A) fails to perform its obligations under
     this Agreement, Party A (Party B) may terminate this Agreement by written
     notice and Party B (Party A) shall be liable to all losses incurred
     thereof.

Party A: ASE (Chung-Li) Inc. [Company chop]
         Chairman: [Chairman's chop]
         Address: No. 550, Chung-hwa Rd., Tao-Yuan County

Party B: ASE Material Inc. [Company chop]
         Supervisor: Feng Mei-Jean [Supervisor's chop]
         Address:Exhibit 4(xx)

I, Joseph Tung, certify that set forth below is a fair and accurate English
translation of the required document included as an exhibit to this
Registration Statement.

                                                     BY: /s/ JOSEPH TUNG
                                                         -----------------------
                                                         Title: CFO/Director
                                                         Dated: May 31, 2002

                         Plant Building Lease Agreement

                                                            Date: 5 October 2001
Parties:
     ASE (Chung-Li) Inc. ("Party A")
     ASE Test Inc. ("Party B")

Whereas, Party A desires to lease its Plant Building, at the 5th floor, No.
550-5, Sec.1, Chung-hwa Rd., Fu-hwa Li, Chung-Li City, Tao-Yuan County to Party
B under the following agreement.

1.   The Premises and Rent

     (1)  Premises: The Plant Building is located at 5th floor, No. 550-5,
          Sec.1, Chung-hwa Rd., Fu-hwa Li, Chung-Li City, Tao-Yuan County
          (building register No. 00225-005 and land register No.: 1833-0000,
          Fu-hsin Section, Chung-Li City), for the area of 4,574.82 square
          meters, inclusive of ancillary equipments (collectively; "Leased
          Floor").

     (2)  Rent: NT$1,135,000 per month, excluding business taxes. Both parties
          agree that the rent will be paid according to the actual area used.

<PAGE>

2.   Term of Lease: one year from 1 November 2001 to 31 October 2002.

3.   Usage: It is for Party B to establish its Chung-Li Plant Building and for
     the uses within its registered business scope. The Party B's Chung-Li
     Plant Building will be applied to be registered to the customs as a bonded
     factory.

4.   The lease shall be for the Leased Floor and existing equipment as they
     are. Party B shall be responsible for the maintenance of the building and
     the equipment except for the building structure (including inner and outer
     walls, floor and the original water and electricity pipelines), which
     shall be Party A's responsibilities. Party B shall make good of any damage
     to the above and Party A shall bear no responsibilities thereof.

5.   Both parties agree that the rent shall be paid starting from the effective
     date of this Agreement.

6.   Party B shall be the owner of any equipment that Party B subsequently
     installs into the premises. After expiry of the lease term, Party B shall
     remove its belongings and return the Leased Floor, under the then current
     condition, to Party A. The ancillary pipelines to Party B's production
     facilities shall also be taken away and restored. Party B, during the term
     of this Agreement, may not engage in any construction altering the
     structure of the Leased Floor unless otherwise agreed by Party A.

7.   During the term of this Agreement, the rent and fees for water and
     electricity utilities shall first be paid by Party A. Party B shall
     reimburse Party A for such payment pursuant to the consumption volume of
     electricity according to the meters separately installed for each of the
     parties. For the utilities that cannot be counted by separate meters, the
     amount of the reimbursement shall apply the same percentage that is used
     for metered utilities. As to the expenses of other utilities that should
     be jointly shared but the volume of each user cannot be decided, the
     amount of the reimbursement shall be calculated by the area used by such
     party or pursuant to another distribution formula mutually agreed by both
     parties. The land tax and building tax shall be borne by Party A.

<PAGE>

8.   After the signing of this Agreement, in the event that it is necessary to
     apply with the relevant authorities (such as the municipal government or
     the electricity company) to register the change of user, Party A shall
     promptly provide relevant materials as requested by Party B.

9.   Party A shall issue invoices to Party B for the collection of rent on a
     monthly basis and Party B shall remit the rent of the preceding month to
     the corporate account designated by Party A within ten days after receipt
     of invoice.

10.  Party A warrants that it has the legal ownership of the
     Leased Floor to be leased to Party B and Party B's leasing rights will not
     be affected by the encumbrances created by Party A or any other incidents
     regarding the Leased Floor. In case Party B's leasing rights are so
     affected, Party A shall be liable to indemnify Party B's loss resulting
     therefrom and pay additional amount equal to three times of monthly rent
     under this Agreement as compensation.

11.  Party A is the legal owner of the leased Leased Floor and shall procure
     fire insurance policy for it. Party B shall be solely responsible to
     procure fire insurance policies for its movables and equipment.

12.  Party B shall pay penalties as follows for delay payment of rent:

     (1)  5% of a monthly rent if delay is more than one month but less than
          two months;

     (2)  10% of a monthly rent if delay is more than two months but less than
          three months; and

     (3)  15% of a monthly rent if delay is more than three months and in which
          case, Party A may terminate this Agreement.

13.  Party B is entitled to a right of first refusal to lease or acquire the
     Leased Floor upon reasonable terms. Party B may not terminate this
     Agreement unless it gives Party A a three-month prior notice in writing
     and compensates Party A for an amount equal to three times of monthly rent
     under this Agreement. In the event Party A intends to early terminate this
     Agreement, the abovementioned terms and conditions shall apply.

<PAGE>

14.  In the event Party A intends to terminate this Agreement within ninth
     month after the lease commences, Party A shall indemnify Party B for all
     construction, partitioning and fitout expenses according to their book
     value, in addition to the three-month rent as stipulated above.

15.  Both parties agree that in the event Party B's bonded factory status is
     cancelled, the bonded goods shall continue staying in the warehouse of the
     Plant Building for not less than six months for the customs' operations.
     All the expenses incurred thereof shall be borne by Party B.

16.  This Agreement will be executed in two counterparts and come into effect
     on the date of signing. Each of Party A and Party B will hold one copy.
     The Tao-Yuan District Court will be the court of first instance in the
     event any dispute arises in connection with this Agreement.

Party A: ASE (Chung-Li) Inc. [Company chop]
         Supervisor: Feng Mei-Jean [Supervisor's chop]
         Address: No. 550, Chung-hwa Rd., Chung-Li City, Tao-Yuan County

Party B: ASE Test Inc. [Company chop]
         Chairman: Jason Chang [Chairman's chop]
         Address: No.10, West Fifth St., Nantze Export Processing Zone,
         Kaohsiung

                                       -4-

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