وقد دفــــع بعــــض المحللين بأن هنـــاك نهجين أساسيين لتقييم حــــالات الإعاقة: (أ) تقدير العجز والفجوة بين المعوقين وغير المعوقين، و (ب) تقدير نسبة العجز في أداء الأدوار الحياتية(31).
Some analysts have argued that there are two basic approaches to the evaluation of handicap: (a) estimation of the gap between persons with and without disabilities, and (b) estimation of specific reductions in life roles.31 As discussed in the preceding section, environmental variables can influence both of these dimensions — and enhance or block achievement of the goals of the World Programme of Action — so all dimensions need to be considered when measuring progress and obstacles in the advancement of persons with disabilities.