A lot of the work I have done DO NOT have tangilble impact? How should I describe it in resume as well as in interview? For example, I have done a five year planning project for an multinational energy firm, a go-to-market strategy for a SaaS company and strategy benchmarking for a information technology company, but I don't even know any tangible impact of it, let alone put the impact on resume/at interview.
What should I do?