Man-made and natural disasters destroy the buildings and render their habitable and operational functionalities unsafe and inappropriate. Thus, stakeholders shall respond to these catastrophes, assess their damages and assign suitable measures to overcome them. Despite several constraints in their implementations, multi-criteria decision-making is of paramount necessity to bridge the gaps between the adopted measures and the requested assistances. Therefore, this thesis will focus on the selection of criteria to conduct the objective and professional assessment. Chapter 1 will underline the topic importance and the primordiality to create a unified guideline for DMs to test the properties and help their residents. Therefore, chapter 2 reviews the numerous approaches and articles to specify their failures in satisfying the stakeholders and contribute in a JIT support. The condition assessments classes and types differ among fields and properties; thus, DMs shall apply the appropriate and accurate tool in examining and scoring their distresses. In the light of multiple techniques, extensions and combinations, this document introduced the first combined method, ITARA-R- modified TOPSIS, for weights eliciting, consistent buildings assessing and categorizing. The R-TOPSIS grants the accuracy and independence from rank reversal problems. Chapter 3 prepared the MCDM process by evaluating the current tools and techniques and result in the creation of a new MCDM modular approach. Thereafter, the modification of this classical TOPSIS approach by adding threshold alternatives discriminates among housing assistance classifications. On the other hand, the thresholds are also determined in weights allocations as well via the indifference threshold-based attribute ratio analysis. The proposed method is based on indifference thresholds and threshold alternatives scores on the selected. The assessment and evaluation of the previous publications and papers resulted in detecting the gaps in their approach and to orient the DMs toward a reliable yet flexible MCDM extension. Thereafter, its application prior Beirut blasts damaged buildings validate its contribution in the decision-making field and investigates its methods’ performance. The results validate its goals satisfactions and accomplishments; hence, modification of the combined tools enables its application for multiple catastrophes, situations, assets and stakeholders. Chapter 4 and 5 validate the work efficacity and flexibility and introduce a new methodology in housing support.Los desastres sacuden las propiedades y debilitan su seguridad y sostenibilidad. Ya sean amenazas naturales o provocadas por el hombre, hacen que la habitabilidad, la funcionalidad y la operatividad de los edificios sean inapropiadas. Por lo tanto, los interesados deberán evaluar directamente los daños y planificar para el soporte habitacional adecuado y preciso de los bloques medidos. Estos planes y estrategias deberán hacer frente a la complejidad de los problemas que se presenten y resaltar las prioridades de apoyo y sus tipos para un conjunto de edificios dañados. Por lo tanto, la combinación de herramientas de toma de decisiones multicriterio y la implementación de sus técnicas para definir las medidas adecuadas es de suma necesidad. Este documento presenta un enfoque modificado para la combinación de ITARA y TOPSIS mientras se hace frente al RRP y los enfoques de estandarización. El esquema de combinación propuesto es, hasta donde sabemos, un enfoque novedoso para categorizar los edificios en peligro con respecto a su asistencia requerida, prioridades, problema de inversión de rango, criterios de umbral y alternativas.