Leachate from wastes in dumpsites constitutes a threat to the quality of dumpsite soil as it contaminates the soil. This paper assesses and compares the level of contamination in the soil of Oke Afa and Soluos dumpsites. Soil samples were taken from different locations in Oke Afa dumpsite at the surface and at the depth of 0.5 m and 1.0 m. Subsequently, soil samples were also collected from Soluos dumpsite at the surface and at the depth of 0.5 m and 1.0 m using stainless knife. All the soil samples were analysed for heavy metals using atomic Absorption Spectrophotometer. The soil samples were also analysed for pH using pH meter. The results of the analysis revealed that the concentrations of parameters analysed were higher in Soluos dumpsite than the Oke Afa dumpsite except for nickel and chromium which were not detected in Soluos dumpsite. The results in addition showed that in Soluos dumpsite, the concentrations of the parameters analysed decrease as the depth increases downward from the surface but in Oke Afa dumpsite, the concentrations of parameters analysed have no regular pattern as the depth increases downward from the surface. In the two dumpsites assessed, the values of the parameters analysed were below the maximum allowable limits for heavy metals in soil. It was concluded that the level of contamination were below the standard used for comparison in both dumpsites but there is likelihood of having higher concentrations of contaminants in future in Soluos dumpsite since the dumpsite is still receiving wastes from Lagos state. Key Words: Assessment, Concentration, Contamination, Comparative, Dumpsites, Soil, Wastes.

Usability is one of the main and core concepts for fulfilling the quality requirements of any software product, particularly web-based systems. A widely used method to measure the level of usability of software applications is heuristic evaluation (HE). In this method, experts commonly use Nielsen’s heuristics to assess the usability of a software product. However, it can also be used by non-experts. Although experts yield better outcomes than non-experts, the former are difficult to obtain and recruit, unlike the latter. In order to improve the effectiveness of heuristic evaluation, several studies have sought to develop its heuristics and procedures. However, there are few studies that involve the end-user within this method, and to the best of our knowledge there are no studies involving end-users with non-expert evaluators within heuristic evaluation method procedures. Therefore, the aim of this study is to investigate the impact of end-users on non-expert evaluator results within the heuristic evaluation process, and through that, to explore the number of usability problems and their severity. The research proposed two sessions: a user exploration session (UES-HE) and a user review session (URS-HE). The former session aims to help the non-expert evaluator to understand the end-user, while the latter session tries to help the non-expert evaluator to review his results through communication with the end-user. One group took part in each session and the outcomes were compared with the traditional HE method as a benchmark. The outcomes show that the end-user has a significant impact on non-expert evaluator results in both sessions through the number and type of usability problems discovered. In the UES-HE method, the results outperformed both URS-HE and HE in terms of usability problems discovered, and it tended to find more major, minor and cosmetic problems than the URS-HE and HE methods. In the URS-HE method, the results outperformed HE but not UES-HE, and tended to find more major problem problems than the HE method. Key Words: Usability, Inspection Usability, Heuristic Evaluation, Non-expert Evaluator, User Session.