Difficulties to formulate specific research methods to use: 3 examples

Difficulties to formulate specific research methods to use: 3 examples

Example 1. My project is to study my personal business venture to launch a new service business, for the zone 2 research objective "to evaluate the business model development capability of ABC Ltd", what research method to use. I am the only person (the founder) of the new venture at this stage?

Example 2. My project is to study my ex-employer, my ex-colleague (as the gatekeeper) introduce me to interview a senior sales representative. Could my dissertation project employs a single research interview on 1 interviewee? To compensate for this research limitation, could I extend my questionnaire survey so that I have more survey data for analysis?

Example 3. My project is to study the sales department of ABC Ltd, and I am the newly appointed sales manager of ABC Ltd. I have difficulties to study the managerial competence of ABC Ltd, as the CEO who employs me is not in the office most of the time and does not like to communicate with the staff at ABC Ltd. CEO appears quite unapproachable. What research methods should I use too study this research objective (on managerial competence) in this case?