This paper is presented in the context of sensitivity analysis (SA) of large-scale data assimilation (DA) models. We studied consistency. convergence. stability and roundoff error propagation of the reduced-space optimization technique arising in parallel 4D Variational DA problems. https://www.spidertattooz.com/Static-Nails-Something-Extra-Rapid-Repair-Nail-Cuticle-Oil-p39591/