Experience: 1st year, 1st quarter
Practice: Developing and Using Abstractions, Creating computational artifacts, Testing and refining computational artifacts, and Communicating about computing
Concept: Algorithms and Control
Overview and Purpose
Coders will trigger sound blocks to play a musical instrument made out of different sprites. The purpose of this project is to review creating sprites and triggering sound blocks when a sprite is tapped. Another purpose of this project is to also introduce remixing.
Objectives and Standards
- I will learn how to trigger sounds and other algorithms when sprites are tapped.
- How can we trigger sounds and other algorithms when sprites are tapped?
- I will create an interactive musical instrument that responds to a user.
- How can we create an interactive musical instrument that responds to a user?
1A-AP-10 Develop programs with sequences and simple loops, to express ideas or address a problem.
- Programming is used as a tool to create products that reflect a wide range of interests. Control structures specify the order in which instructions are executed within a program. Sequences are the order of instructions in a program. For example, if dialogue is not sequenced correctly when programming a simple animated story, the story will not make sense. If the commands to program a robot are not in the correct order, the robot will not complete the task desired. Loops allow for the repetition of a sequence of code multiple times. For example, in a program to show the life cycle of a butterfly, a loop could be combined with move commands to allow continual but controlled movement of the character. (source)
1A-AP-08 Model daily processes by creating and following algorithms (sets of step-by-step instructions) to complete tasks.
- Composition is the combination of smaller tasks into more complex tasks. Students could create and follow algorithms for making simple foods, brushing their teeth, getting ready for school, participating in clean-up time. (source)
1A-AP-11 Decompose (break down) the steps needed to solve a problem into a precise sequence of instructions.
- Decomposition is the act of breaking down tasks into simpler tasks. Students could break down the steps needed to make a peanut butter and jelly sandwich, to brush their teeth, to draw a shape, to move a character across the screen, or to solve a level of a coding app. (source)
1A-AP-14 Debug (identify and fix) errors in an algorithm or program that includes sequences and simple loops.
- Algorithms or programs may not always work correctly. Students should be able to use various strategies, such as changing the sequence of the steps, following the algorithm in a step-by-step manner, or trial and error to fix problems in algorithms and programs. (source)
1A-AP-15 Using correct terminology, describe steps taken and choices made during the iterative process of program development.
- At this stage, students should be able to talk or write about the goals and expected outcomes of the programs they create and the choices that they made when creating programs. This could be done using coding journals, discussions with a teacher, class presentations, or blogs. (source)
Practices and Concepts
Practice 4: Developing and Using Abstractions
- "Abstractions are formed by identifying patterns and extracting common features from specific examples to create generalizations. Using generalized solutions and parts of solutions designed for broad reuse simplifies the development process by managing complexity." (p. 78)
- P4.4. Model phenomena and processes and simulate systems to understand and evaluate potential outcomes. (p. 79)
Practice 5: Creating computational artifacts
- "The process of developing computational artifacts embraces both creative expression and the exploration of ideas to create prototypes and solve computational problems. Students create artifacts that are personally relevant or beneficial to their community and beyond. Computational artifacts can be created by combining and modifying existing artifacts or by developing new artifacts. Examples of computational artifacts include programs, simulations, visualizations, digital animations, robotic systems, and apps." (p. 80)
- P5.2. Create a computational artifact for practical intent, personal expression, or to address a societal issue. (p. 80)
- P5.3. Modify an existing artifact to improve or customize it. (p. 80)
Practice 6: Testing and refining computational artifacts
- "Testing and refinement is the deliberate and iterative process of improving a computational artifact. This process includes debugging (identifying and fixing errors) and comparing actual outcomes to intended outcomes. Students also respond to the changing needs and expectations of end users and improve the performance, reliability, usability, and accessibility of artifacts." (p. 81)
- P6.1. Systematically test computational artifacts by considering all scenarios and using test cases." (p. 81)
- P6.2. Identify and fix errors using a systematic process. (p. 81)
Practice 7: Communicating about computing
- "Communication involves personal expression and exchanging ideas with others. In computer science, students communicate with diverse audiences about the use and effects of computation and the appropriateness of computational choices. Students write clear comments, document their work, and communicate their ideas through multiple forms of media. Clear communication includes using precise language and carefully considering possible audiences." (p. 82)
- P7.2. Describe, justify, and document computational processes and solutions using appropriate terminology consistent with the intended audience and purpose. (p. 82)
- "Control structures specify the order in which instructions are executed within an algorithm or program. In early grades, students learn about sequential execution and simple control structures. As they progress, students expand their understanding to combinations of structures that support complex execution." (p. 91)
- Grade 2 - "Computers follow precise sequences of instructions that automate tasks. Program execution can also be nonsequential by repeating patterns of instructions and using events to initiate instructions." (p. 96)
- "Algorithms are designed to be carried out by both humans and computers. In early grades, students learn about age-appropriate algorithms from the real world. As they progress, students learn about the development, combination, and decomposition of algorithms, as well as the evaluation of competing algorithms." (p. 91)
- Grade 2 - People follow and create processes as part of daily life. Many of these processes can be expressed as algorithms that computers can follow." (p. 96)
- A step-by-step process to complete a task. (source)
- A formula or set of steps for solving a particular problem. To be an algorithm, a set of rules must be unambiguous and have a clear stopping point. (source)
- The process of finding and correcting errors (bugs) in programs. (source)
- To find and remove errors (bugs) from a software program. Bugs occur in programs when a line of code or an instruction conflicts with other elements of the code. (source)
- An action or occurrence detected by a program. Events can be user actions, such as clicking a mouse button or pressing a key, or system occurrences, such as running out of memory. Most modern applications, particularly those that run in Macintosh and Windows environments, are said to be event-driven,because they are designed to respond to events. (source)
- The computational concept of one thing causing another thing to happen. (source)
- Any identifiable occurrence that has significance for system hardware or software. User-generated events include keystrokes and mouse clicks; system-generated events include program loading and errors. (source)
- The process of creating something new from something old. Originally a process that involved music, remixing involves creating a new version of a program by recombining and modifying parts of existing programs, and often adding new pieces, to form new solutions. (source)
- A creative work that is derived from an original work (or from another remix). A remix typically introduces new content or stylistic elements, while retaining a degree of similarity to the original work. (source)
- A media object that performs actions on the stage in a Scratch project. (source)
More vocabulary words from CSTA
- Potential subjects: Media arts, music
- Example(s): Rather than simply playing back a recording of a single note when a sprite is tapped, this project could be modified to ask coders to record short musical phrases that play when a sprite is tapped. This would enable coders to align their project with performance standards in a music context. Click here to see other examples and share your own ideas on our subforum dedicated to integrating projects.
- Digital musicians often record their own samples and play them back in a musical sequence (similar to an algorithm) or by pressing keys on a MIDI instrument or control. Artists create models of objects for use in advertisements, movies, games, and other forms of physical or online media. Click here to visit a website dedicated to exploring potential careers through coding.