The paper is a study of micro and macro biological changes of wetland ecology, a region once used for both agricultural and industrial purposes. It is now under wetland restoration. The study area has been used both as a waste dump, fossil fuel deport and extensive cultivation around lake Hjälmaren on the Eastern side of Örebro City.

The Cleanroom method of Software Engineering ensures high-quality software with certified reliability, which is an important aspect of every software product. The certification process needs a reasonable statistical user testing strategy to measure the software reliability. We propose a mechanism to reduce testing time as well as effort while performing statistical user testing so that software quality is not diluted as well as maintaining a high degree of software reliability. We also cover a brief history of cleanroom software engineering approach.