Tenses in introduction and summary of every chapter I am writing an undergraduate dissertation. I am not quite sure what tenses should I use when introducing a chapter and summarizing it. Should I refer to that chapter in present, future or past tenses. E.g. 

Intro:


  This chapter provides information about the research methods used in the project. Before conducting a series of experiments to explore and evaluate machine learning methods, it was needed to decide on how are these algorithms are going to be implemented and evaluated.


Summary:


  In this chapter reasoning behind a chosen programming language and machine learning library used was provided. It was also described how image classifiers that uses machine learning algorithms are going to be built. Finally, methods for evaluating the performance of classification algorithms were discussed and accuracy score was picked as the main method for performance evaluation. In the following chapter, accumulation of a food image dataset is going to be discussed.


Also, if I use an introduction  in one of the chapters of the dissertation, must I also include that heading in all the chapters. Some of the chapters are long so they must have intro, but there are some that are very straightforward, so I am not sure weather it is needed.
Always use the logically correct tense. Present or future for references to later chapters (that's a matter of taste), present for things that will be true at any time in the forseeable future, past for references to past events (e.g. a decision on how to proceed the studies, observation made during your own experiment, summary, where you recount what you did prove twenty pages ago).