constrictions, limitations, pressures, strictures, challenges, restraints, difficulties, restrictions, impediments, hindrances, bottlenecks, obstacles, requirements, crunch, complexities, realities, constraining, hardships, burdens, dilemmas, exigencies, considerations, limits, problems, stipulations, vagaries, shortfalls, straitjacket, imperatives, scarcity, deadlines, disadvantages, constricting, timelines, shortage, demands, stresses, barriers, uncertainty, inflexibility, roadblocks, hassles, compulsions, gluts, fetters, impositions, conundrum, stringency, parameters, obligations, obtrusiveness, straightjacket, lacunas, delays, cutbacks, issues, hurdles, drawbacks, quandaries, impracticality, inequities, crowdedness, inconveniences, encumbrances, inertia, oversupply, crises, flexibility, mandates, shortcomings, obstructions, hitches, conditions, snags, smallness, dearth, sensitivities, hiccups, strain, infeasibility, inadequacy, pitfalls, overcapacity, concerns, regulations, budgets, dichotomies, burdon, ambiguities, paradoxes, woes, paucity, tightness, overruns, overstretch, undersupply, shackles, squeeze, conditionality, downsides, commitments, adversities, constraint, preconditions, aspects, prerequisites, vulnerabilities, criteria, responsibilities, competences, controls

campaign, free rein, linear programming, military campaign, play