31 The main subject of the Appendix and the summary of payments in it is the total amount of the payments to be made to the Architect. The Appendix is not primarily directed to establishing when payments are to be made, does not mention Progress Payments and is not limited to establishing the amount to which the Architect is entitled as Progress Payments. The Appendix contains Special Conditions on page 7 of the Agreement, and these are Special Conditions relating to the subject with which the Appendix deals. The Basis of Payment for Stage A1 refers to "the total estimated cost of the Works" and by contrast the Basis of Payment for later Stages is "the total cost of the Works." The Basis of Payment and the Appendix deal with payment for the Architects' services in whatever circumstances they come to be paid for, including (to take cases with which the Agreement expressly deals elsewhere), when there is an entitlement to a Progress Payment and when the services of the Architect are terminated, and when the Project does not go further than one of the described stages.
32 When considering ascertainment of the amount of the fee for Stage A1 it is necessary to notice provisions of cl C1.01(c)(i), which operates if the services of the Architect are terminated prior to tender. So cl C1.01(c)(i) is next in the order of reading. It gives machinery for ascertaining the cost of the Works prior to Tender, and it is on this machinery that the reference in the Basis of Payment to "the total estimated cost of the Works" relies when it uses the word "estimated", derivatives of which appear in the handwritten additions to cl C1.01(c)(i). The next passage to read after the Appendix and cl C1.01(c)(i) is cl C1.01(d). The words of cl C1.01(c)(i) and (d) show that they were intended to apply to Progress Payments and also to termination of services.
33 The order of reading then turns to Progress Payments in cl B3.01. The printed words of cl B3.01 contemplate that there may be Special Conditions about Progress Payments, and its handwritten words expressly refer to the Special Conditions on page 6 of the Agreement (these are not the Special Conditions in the Appendix on page 7). The Special Conditions on page 6 open with passages [1] and [2] dealing with cl B3.01 and Progress Payments. They then turn aside to passages [3] and [4] dealing with cl B3.08 relating to 'Other Services', and specifically with architectural services in connection with a Land and Environment Court hearing. There is no provision for Progress Payments for 'Other Services'. The Special Conditions then turn to passages dealing with 'Each Stage of the Architectural Service'. These passages do not deal only with Progress Payments: they open with passage [5] which says "Commencement to be authorised in writing." and then return to dealing with payments, and what they say about Stages A1, A2 and A3 is very obscurely expressed; what they say about Stage A4 in passage [8] is clearly related to monthly payments, that is to Progress Payments. To my mind the context shows that what passage [6] says about Stage A1 relates to the subject with which the Special Conditions opened, the subject for which the reader was directed from cl B3.01 to page 6, that is, to Progress Payments. To my mind it is not the correct reading of what passages [6] and [7] say about Stages A1, A2 and A3 that they were intended to deal comprehensively with the Architect's entitlement to payment for services relating to Stage A1. Passage [6] makes specific, in the case of Stage A1, the reference higher at passage [2] to Progress Payments of 60% payable "3 months after commencement of each 3-month service stage or upon completion of that service stage, which ever is the later" by substituting, in the case of Stage A1, the time "when the complete set of documents in support of the Development Application is to Client's satisfaction and ready for lodgement" as the time for payment of the balance in substitution for the less clearly indicated time for payment of the balance earlier provided for. Passage [6] does not in any way diminish or affect a right, such as the right to an adjustment under cl C1.01(d), which may arise at a later time.
34 The Special Conditions on page 6 of the Agreement establish when Progress Payments are to be made but they do not establish how much is to be paid: to what the figures of 20% and 60% relate. The machinery for assessing Progress Payments is found in cl C1.01(c)(i) and can produce different results at different times. For example, when a second Progress Payment came to be payable, the most recent opinion of probable cost available and conforming to cl C1.01(c)(i) might be greater or less than the opinion of probable cost available when the earlier Progress Payment became payable; a Progress Payment should be a percentage of the currently most recent opinion. The respondents' fourth Progress Claim, which claimed $17,500.00 and took the total fees to date to $105,000.00, and was made on 29 March 1996, does not neatly fit into the scheme of Progress Claims authorised by passages [1] and [2] in the Special Conditions on page 6; it is a Progress Claim for less than 60%, but it took the total Progress Claims for Stage A1 to the 100% which was to fall due upon completion of a Service Stage, and it can be mathematically inferred that the Progress Claims were calculated on the basis that the appropriate most recent opinion of probable cost was then $12,500,000.00; the estimate by Cordukes was not made until later. The assumption apparently implied about $12,500,000.00 as the reference figure and the split into four Progress Payments and not three were not challenged, the invoice of 29 March 1996 was paid and the respondents did not sue to enforce the entitlement, referred to in passage [6] of the Special Conditions on page 6, to the balance of fees payable when the complete set of documents was ready for lodgement. In my opinion this provision of the Special Conditions on page 6 does not establish any relevant accrual date for the debt which the respondents have actually claimed.
35 In the ordinary workings of the Agreement and if all stages of the project were carried out, no occasion would ever arise to establish finally the quantum of entitlement of the Architect to payments for Stage A1. The Architect would be paid Progress Payments for Stage A1, and the fees received for Stage A1 would be deducted from the 75% of 5.6% of the total costs of the Works payable for Stage A2. To ascertain the fees payable for Stages A2 and A3 it would be necessary to establish the total cost of the Works, but it would be an academic question how much should have been paid for Stage A1 or whether the total estimated cost upon which payments for Stage A1 had been based was correct. Final ascertainment of the entitlement of the Architect to fees for Stage A1 could only become significant if the project were interrupted in some way and the Architect did not perform the services in Stages A2 and A3; that is what actually happened.
36 Notwithstanding the general obscurity of the Agreement I am of opinion that the Agreement contemplates, and at least by implication provides for an entitlement of the Architect to payment for services if his services are terminated, which entitlement is different to entitlements to Progress Payments, for Stage A1 or for any Stage. This most clearly appears from the second sentence in cl C1.01(d):-
Where the Architect's services are terminated prior to completion of the Works, progress payments are adjusted in accordance with the most advanced stage reached under C1.01.c).