【教えて下さい】「I GUESS THIS IS IT.」の意味

The qualification criteria should be simple and transparent, using quantitative indicators as much as possible, so that potential users can reasonably guess their possible qualification to a Reserve Augmentation Line (RAL). It is often perceived that there is not much demand for a new instrument, but I believe that this low demand is partly due to the uncertainty surrounding the eligibility criteria.
まず、新融資制度への需要が大きくないのは、その適格要件が不明確であることが要因の一つであり、できるだけ定量的な指標を用いた簡素かつ透明性のある適格要件を設定することによって、潜在的な資金利用国がRALの承認を受けられるかどうか予測可能な仕組みとするべきです。

http://ejje.weblio.jp/sentence/content/I+GUESS+THIS+IS+IT