「後續擴充制度」在實質上為縮減招標之時間差與傾向廠商之激勵而制定出有保留未來增購權利之條款，可是採購法施行至今，機關在使用上卻尚未將此制度之優勢發揮至最大。以工程採購為例，89年至97年之工程採購案件逾72萬件，其中卻只有2萬多件採購案採行後續擴充制度，所佔工程採購之整體比率似乎太少，工程採購之範圍廣泛，個案所需擴充方式及執行困難度也大不相同，而採購最前期也是最重要的環節當屬規劃設計方面，但現行機關對後續擴充之規劃面卻因欠於考量，未於適合之工程採購案件中使用，實為可惜，而許多工程採購實際上可以後續擴充辦理，但機關卻未適時的使用，在採購造成多次發包而浪費重複招標之成本。所以，若能有效的選擇出適用與不適用以後續擴充方式辦理之工程採購，除了節省資源之浪費，更能進一步帶出後續擴充制度中之誘因機制，以促進廠商履約之動力，提升採購之效率。 本研究針對現行後續擴充執行現況及工程採購特性問題作一深入瞭解，配合後續擴充制度之法規與多位專家所討論之適用性因子為原則，歸納出影響後續擴充制度在工程採購上運用之適用因子，以問卷調查方式，分析各因子之重要性，並建立一後續擴充制度適用性評估機制，提供給機關於適用之工程中執行，期能以適用於後續擴充制度之工程採購選擇最適化，協助機關決策者考量與工程之執行，使採購如期、如質，並達事半功倍之效，令採購執行無縫化。 “Procurement Extension” is an innovative model in Government Procurement Law, of which an agency can minimize the effort of public tendering by announcing multi-stage procurement cases at once. The merit of this model is therefore to provide an incentive for bid winner firm to perform at best effort. Nonetheless, this model has not received its deserving welcome in government agencies, in that out of more than 720,000 procurement cases only 20,000 of them adopt procurement extension. This work believes the root cause for this neglect evolves from the lack of experience in most agencies. The purpose of this work is to investigate, from past cases, the characteristics of government procurement which are most amicable to procurement extension. This work first identifies the likely features to which procurement extension is most suitable, primarily based on a question survey. Then, these features are screened and tested to verify their merit and to be used in an AHP model, in order to rank their importance. The outcome of the study is a short-list criteria which render rather straightforward to evaluate whether a given procurement case is suitable to or needed procurement extension. The contribution of this work is that future government agencies can use the finding of this work to screen down cases in which procurement extension may be an option.
