1 INTRODUCTION  
2 EFFECTS OF DM-MASSIVE NEUTRINO INTERACTION ON LINEAR PERTURBATIONS  
3 OBSERVABLES AND MOCK LIKELIHOODS IN FUTURE 21-CM AND GALAXY SURVEYS  
4 FISHER FORECAST, MCMC ANALYSIS AND ERRORS  
5 RESULTS AND ANALYSIS  
6 FISHER FORECAST ON FUTURE CMB MISSIONS: A BRIEF INVESTIGATION  
7 SUMMARY  