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Formwork selection problem has been discussed since early 90’s until now by various researchers all over the world. Numerous methods have been applied to solve this problem, but not TOPSIS method, which is a technique for order performance by similarity to ideal solution. The paper briefly describes the algorithm of TOPSIS and its advantages over other MCDA methods. An appropriate example presents how to aid formwork selection using TOPSIS. The decisive criteria, their importance weights and formwork systems’ assessment, which are mandatory to solve the problem within the method, were obtained from a structured survey carried out among concrete works’ contractors.

Work safety control and analysis of accidents during construction performance are one of the most important issues of construction management. The paper focuses on post-accident absence as an element of occupational safety management. Somehow, the length of the post-accident absence can be treated as an indicator of building performance safety. The paper attempts to answer the question of whether it is possible to use boosted classifier ensembles to predict the post-accident absence length using a small set of historical observations, and which classification algorithm is the most promising to solve the prediction problem. It also proves that there is a dependence between the length of the post-accident absence and the cause of the accident or working conditions The choice of boosted algorithms is not accidental. Thanks to the use of aggregation methods it is possible to build classifiers that predict precisely and do not require any initial data treatment, which simplifies the prediction process significantly. The model of the prediction problem has been clarified. To identify the most promising classifier ensemble the prediction accuracy measures of selected classification algorithms were analyzed. The data used to build models was gathered on national (Polish) construction sites.

The present paper concerns a problem of decisive criteria and their order in formwork selection problem.As the factors affecting the choice of exact form work system have been often discussed in literature, their importance has not been distinctly formulated yet, what hampers aiding formwork selection with MCDA methods that require criteria weights (eg.: SAW, TOPS IS etc.). Therefore, author ran a survey -the decisive criteria were recognized and verified witbin polls send to various contractors. An analysis of survey results including criteria ordering is a subject of the present elaboration.

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